BMW E90/E91/E92/E93 Resources

Buyer's Guide

What to know before purchasing a E90

Overview

The BMW E90/E92/E93 3 Series (2006-2013) represents BMW's transition into the modern era with more technology, more power, and more complexity. The N52 and N54/N55 turbocharged inline-sixes offered impressive performance, while the E90 M3 with its screaming 4.0L V8 S65 engine became an instant classic. Build quality remained high, and these cars offer modern amenities with the last vestiges of hydraulic steering feel. However, the increased complexity means higher maintenance costs, and the turbocharged engines have known reliability concerns that must be addressed.

Quick Facts

Production 2006-2013

Total Produced ~3.0 million worldwide

Price Range $8,000 - $70,000+

Best Years 2011-2013 (LCI facelift, refined engines)

Model Variants

325i / 328i

2006-2013

The naturally aspirated models with N52 3.0L inline-six producing 215-230 hp. Reliable and efficient. The 328i is the sweet spot for daily driving.

Desirability: Medium

335i

2007-2013

The turbocharged model with N54 (2007-2010) or N55 (2011-2013) producing 300-300 hp. Serious performance potential but requires more maintenance.

Desirability: High

335is

2011-2013

Special edition with N54 engine producing 320 hp, 7-speed DCT available, and M Sport styling. Limited production.

Desirability: High

M3 (E90/E92/E93)

2008-2013

The legendary S65 4.0L V8 producing 414 hp and revving to 8,400 rpm. Available as sedan, coupe, and convertible. Manual and DCT options.

Desirability: High

328xi / 335xi

2007-2013

All-wheel drive variants. xDrive system is sophisticated but adds weight and complexity.

Desirability: Medium

Pre-Purchase Inspection Checklist

Critical areas to examine before purchasing. Bring this checklist when viewing a E90.

Engine (N54 335i)

High Pressure Fuel Pump (HPFP) Known failure point causing rough running and reduced power. Extended warranty covered many but not all. If bad: $500-1,000
Wastegate Rattle Turbos develop wastegate rattle, eventually requiring turbo replacement. Listen on cold start. If bad: $2,000-4,000 for turbo replacement
Injector Leaks Fuel injectors can develop leaks causing rough running and codes. Index 12+ injectors preferred. If bad: $800-1,500
Charge Pipe Plastic charge pipe can crack under boost, especially with tune. Aftermarket aluminum recommended. If bad: $300-500
Oil Filter Housing Gasket Extremely common leak point on N54 and N55. Check for oil around the filter housing. If bad: $400-700
Valve Cover Gasket Oil leaks from the valve cover gasket are common with age. If bad: $400-800

Engine (S65 M3)

Rod Bearings The S65 V8 has known rod bearing wear issues, especially with track use. Check service records. If bad: $3,000-5,000 preventative / Engine if failed
Throttle Actuators The individual throttle bodies can fail. Check for codes and rough running. If bad: $1,500-3,000
VANOS Complex variable valve timing system can develop issues. Listen for rattle. If bad: $1,500-3,000
Oil Consumption Some S65 engines consume oil. Check level and ask about consumption rate. If bad: Monitor and top up regularly

Cooling & Electrical

Water Pump (Electric) Electric water pump can fail without warning. Common on all E90 engines. If bad: $500-900
Thermostat Electric thermostat fails, causing overcooling or overheating. If bad: $200-400
Ignition Coils Coil packs fail causing misfires. Usually replaced in sets. If bad: $200-400 for set
Battery Registration E90 requires battery registration when replaced. Verify proper charging. If bad: $50-100 for registration
iDrive System If equipped, check iDrive controller and screen functionality. If bad: $500-1,500

Suspension & Drivetrain

Control Arm Bushings Front control arm bushings wear causing clunking and vague steering. If bad: $400-700
Rear Trailing Arm Bushings RTAB wear affects handling and causes tire wear. If bad: $300-500
DCT Transmission (M3) The dual-clutch M DCT requires fluid service. Check for shudder or harsh shifts. If bad: $300 for service / $3,000+ for repair
Differential Output Seals Rear differential can develop leaks. Check for oil on the inside of rear wheels. If bad: $300-500

Body & Interior

Rust (Minimal) E90s are better galvanized than predecessors, but check rockers and wheel wells. If bad: Varies
Headlight Lenses Plastic headlight lenses yellow and haze with age. If bad: $100-300 for restoration
Door Seals Check for wind noise indicating worn seals. If bad: $200-400
Sport Seat Bolsters Sport seat bolsters wear on driver's side entry point. If bad: $300-800 for reupholstery

Pricing Guide

Prices as of 2026. Values vary by location, options, and market conditions.

Project Car

$5,000 - $10,000

High-mileage cars with deferred maintenance or known issues. N54 cars often need turbos.

Driver Quality

$10,000 - $20,000

Running well but with some wear. Budget for maintenance items. Many good 328i examples here.

Excellent

$20,000 - $40,000

Well-maintained 335is or clean M3 examples with service history.

Concours / Collector

$40,000 - $80,000+

Low-mileage M3 with documented maintenance. Manual transmission and desirable colors command premium.

Red Flags - Walk Away If...

N54 engine with unknown turbo or injector status
M3 without rod bearing service documentation
Check engine light with multiple codes
Overheating history
DCT transmission shudder or harsh engagement
Oil consumption over 1 quart per 1,000 miles
Missing maintenance records on high-mileage cars
Extensive tuning modifications without supporting upgrades

What to Look For

Desirable features and options that add value:

Manual transmission (6-speed)
Service records showing major maintenance completed
N55 engine over N54 for improved reliability (335i)
M3 with documented rod bearing service
M Sport package for enhanced styling and suspension
Coupe (E92) body style for best looks
LCI facelift models (2011+) for refinements
Lower mileage examples - these are complex cars
Colors like Le Mans Blue, Interlagos Blue, or Jerez Black M3
Working iDrive and premium sound if equipped

Ownership Costs

Insurance $1,200-2,500/year (M3 higher)

Annual Maintenance $1,500-3,500 for regular service

Common Repairs $1,000-2,500/year typical (N54/M3 higher)

Fuel Economy 18-26 MPG depending on model

Expert Tips

The 328i with N52 engine is the most reliable option for daily driving
N54 335i is a tuner's dream but requires diligent maintenance
N55 335i (2011+) addressed many N54 reliability issues - prefer it for a driver
M3 rod bearing service is mandatory - verify completion or budget immediately
The M3's S65 V8 is one of the greatest engines BMW has ever made - worth the maintenance
Electric water pump failure can happen without warning - some owners replace preventatively
HPFP extended warranty only applies to original owner - factor this into used purchase
The 335is combines N54 power with 335i reliability updates - rare but desirable
DCT in the M3 is excellent when maintained but manual is more engaging
E90 suspension components are wear items - budget for bushings and control arms

Common Issues

Known problems, symptoms, and solutions for the E90 platform

Electric Water Pump and Thermostat Failure

Moderate

Symptoms: Overheating, coolant warning, reduced power mode, water pump whining, engine shut down

The E90 generation was the first to use BMW's electric water pump and electronic thermostat. Both components have high failure rates, typically between 60,000-100,000 miles. When the water pump fails, there is no warning - the engine can overheat rapidly. The pump may also become noisy before complete failure. These are considered wear items requiring proactive replacement.

Estimated Repair Costs

DIY $200-400

Shop $600-1200

Electric water pump on N52/N54. Thermostat often done together.

Common Fixes

Proactive water pump replacement at 80,000 miles
Replace thermostat at the same time
Use OEM or quality German-made parts (Pierburg/VDO)
Don't ignore any coolant warning lights
Consider replacing when doing timing chain service (N20/N54/N55)

Common Parts

Part	Part Number	Est. Price
Electric Water Pump (N52)	11517586925	$300-500
Electric Water Pump (N54)	11517632426	$350-550
Thermostat (Electric)	11537549476	$80-150

Sources: E90Post, Bimmerpost

Oil Leaks (Valve Cover and Oil Filter Housing)

Moderate

Symptoms: Oil smell, visible oil on engine, oil spots under car, smoke from engine bay, low oil warning

The E90's N52 and N5x engines develop oil leaks as they age. The valve cover gasket is a very common leak point due to the plastic valve cover warping from heat. The oil filter housing gasket (OFHG) is another notorious leak point that can drip oil onto hot exhaust components, creating fire risk and smoke.

Estimated Repair Costs

DIY $100-300

Shop $300-700

Valve cover and oil filter housing gaskets common.

Common Fixes

Valve cover gasket replacement - consider replacing entire valve cover (plastic warps)
Oil filter housing gasket - common leak, relatively accessible
Oil cooler gasket (if equipped)
Eccentric shaft sensor seal (N52)
Address oil leaks promptly - oil on exhaust is fire hazard

Common Parts

Part	Part Number	Est. Price
Valve Cover Gasket (N52)	11127552281	$40-80
Valve Cover Gasket (N54)	11127565284	$50-90
Oil Filter Housing Gasket	11428637820	$15-30

Sources: FCP Euro, E90Post

High Pressure Fuel Pump Failure (N54/N55)

Advanced

Symptoms: Long crank time, rough idle, loss of power, engine stalling, check engine light, limp mode

The N54 and early N55 engines use a mechanical high-pressure fuel pump (HPFP) driven by the intake camshaft. Early versions were prone to failure, causing drivability issues or complete stalling. BMW extended warranty coverage on early pumps. Later revisions improved reliability.

Estimated Repair Costs

DIY $400-700

Shop $700-1200

N54 only. High pressure fuel pump failure causes rough running.

Common Fixes

Check for updated HPFP part number (several revisions exist)
Replace with latest revision pump if experiencing issues
Monitor fuel pressure with diagnostic tool if symptoms appear
Later production N55 engines have improved pumps

Common Parts

Part	Part Number	Est. Price
High Pressure Fuel Pump	13517616170	$400-700

Sources: N54Tech, Bimmerpost

Fuel Injector Problems (N54/N55)

Moderate

Symptoms: Rough idle, misfires, check engine light, poor fuel economy, hesitation

The direct injection N54 engine is known for fuel injector issues, including leaking and failure to atomize fuel properly. The piezoelectric injectors are expensive and can fail individually or multiple at once. Index 12 injectors are the latest revision with improved reliability. N55 injectors are generally more reliable but can still fail.

Estimated Repair Costs

DIY $300-600

Shop $600-1200

N54 piezo injectors. Replace as set if multiple fail.

Common Fixes

Replace failed injectors with latest index revision (Index 12 for N54)
Replace all injectors at once if multiple failures (common on N54)
Verify injector index before ordering
Use quality fuel to reduce injector wear
Walnut blast intake valves while replacing injectors

Common Parts

Part	Part Number	Est. Price
Fuel Injector (Index 12)	13538616079	$80-120 each
Injector Seal Kit	Various	$30-60

Sources: N54Tech, E90Post

VANOS Solenoid and System Issues

Moderate

Symptoms: Rough idle, loss of power, engine rattle, check engine light, fault codes for VANOS

All E90 engines use VANOS variable valve timing. The VANOS solenoids can fail or become clogged with oil sludge, especially with extended oil change intervals. The N54 and N55 also have VANOS-related issues with the adjustment units themselves, including the bolts backing out and damaging components.

Estimated Repair Costs

DIY $100-200

Shop $250-500

Solenoid failures cause rough idle and codes.

Common Fixes

Replace VANOS solenoids (relatively inexpensive service)
Clean VANOS system if sludge buildup suspected
Use quality oil and don't exceed oil change intervals
N54/N55: VANOS bolt recall - verify upgrade bolts installed
Timing chain tensioner service may be needed (N20)

Common Parts

Part	Part Number	Est. Price
VANOS Solenoid (N52)	11367585425	$100-180
VANOS Solenoid (N54)	11367516293	$100-180

Sources: Beisan Systems, Bimmerpost

Turbo Wastegate Rattle (N54)

Advanced

Symptoms: Rattling noise on cold start, rattle under load, metallic rattling from engine bay

The N54's twin turbochargers develop wastegate rattle due to wear in the wastegate actuator mechanism. The rattle is typically worst on cold startup and may diminish when warm. While the turbos still function with this rattle, it indicates wear that will eventually require turbo replacement or rebuild.

Estimated Repair Costs

DIY $800-1500

Shop $2000-4000

N54 turbos. Wastegate rattle common. Replacement often in pairs.

Common Fixes

Wastegate actuator replacement or adjustment (temporary fix)
Turbo rebuild with upgraded wastegate components
Turbo replacement (OEM or upgraded aftermarket units)
Upgraded pure turbos or Vargas units for performance builds

Common Parts

Part	Part Number	Est. Price
Turbocharger (each)	11657649291	$600-1000
Turbo Oil Line Kit	11427573211	$80-150

Sources: N54Tech, E90Post

Carbon Buildup on Intake Valves (Direct Injection Engines)

Advanced

Symptoms: Rough idle, misfires, reduced power, poor fuel economy, hesitation

All direct injection engines (N54, N55, N20) are susceptible to carbon buildup on the intake valves. Because fuel is injected directly into the cylinder rather than onto the valves, there is no fuel washing the valves clean. Over time, carbon deposits accumulate, affecting airflow and performance. Walnut blasting is the standard solution.

Estimated Repair Costs

DIY $150-300

Shop $400-800

N54 direct injection. Walnut blasting required every 50-60k.

Common Fixes

Walnut shell blasting every 50,000-80,000 miles
Chemical treatments (less effective but less invasive)
Catch can installation to reduce oil vapor deposits
Use quality fuel with good detergent additives
Combine with injector replacement or other intake work

Common Parts

Part	Part Number	Est. Price
Walnut Media	N/A	$30-50
Intake Gaskets	11617547242	$25-50

Sources: E90Post, N54Tech

Rod Bearing Wear (S65 M3)

Advanced

Symptoms: Knocking noise, engine rattle, low oil pressure, metal in oil

The S65 V8 in the E90/E92/E93 M3 has a known rod bearing wear issue. The factory bearings can wear prematurely, especially with track use or aggressive driving. If caught early, bearings can be replaced. If ignored, bearing failure leads to catastrophic engine damage. Oil analysis is crucial for monitoring.

Estimated Repair Costs

DIY $500-1000

Shop $2500-4500

S65 V8 (M3) only. Preventive replacement recommended.

Common Fixes

Regular oil analysis to detect bearing wear early (essential for M3 owners)
Proactive rod bearing replacement (BE bearings recommended)
Use appropriate oil (10W-60 recommended for track use)
Proper warm-up and cool-down procedures
Address any abnormal noise immediately

Common Parts

Part	Part Number	Est. Price
Rod Bearing Set (ACL)	Various aftermarket	$150-300
Rod Bolts	11247840093	$100-200

Sources: M3Post, Bimmerpost

Timing Chain and Guide Issues (N20/N54/N55)

Advanced

Symptoms: Timing chain rattle, rough running, check engine light, chain stretch codes, failure to start

The N20 four-cylinder engine has documented timing chain stretch and guide wear issues, sometimes at relatively low mileage. The N54 and N55 six-cylinders can also have chain and guide wear at high mileage. Ignoring chain stretch can lead to jumped timing and engine damage.

Estimated Repair Costs

DIY $400-800

Shop $1500-3000

N54/N55 timing chain stretch. Often guides and tensioner too.

Common Fixes

Monitor for timing chain stretch via diagnostic codes
Replace chain, guides, and tensioner as a kit
N20: Known issue - may be covered under BMW's extended coverage
Consider proactive replacement on high-mileage N54/N55
Replace water pump and thermostat while apart

Common Parts

Part	Part Number	Est. Price
Timing Chain Kit	Various	$300-500
Chain Guide Set	Various	$150-300

Sources: Bimmerpost, FCP Euro

Restoration Guides

Comprehensive guides for rebuilding and restoring your E90

Complete Suspension Refresh

Intermediate 10-14 hours $600-1,200

Full front and rear suspension rebuild for the E90's modern multi-link design including control arms, thrust arms, and rear trailing arm bushings to restore factory handling.

Interval Every 80,000-100,000 miles

Cost (DIY) $600-1,200

Labor 8-12 hours shop time

Parts List

Part	OEM Number	Aftermarket	Est. Cost
Front Lower Control Arm (Left)	31126770849	Lemforder 35606 01, Meyle HD	$50-90
Front Lower Control Arm (Right)	31126770850	Lemforder 35607 01, Meyle HD	$50-90
Front Thrust Arm (Tension Strut) Left	31126770851	Lemforder 35608 01, Meyle HD	$50-85
Front Thrust Arm (Tension Strut) Right	31126770852	Lemforder 35609 01, Meyle HD	$50-85
Tie Rod Assembly (Pair)	32106793457	Lemforder, Meyle	$70-140
Front Strut Mount (Pair)	31336760943	Lemforder, Sachs	$60-120
Front Sway Bar End Link (Pair)	31356765933	Lemforder 35595 01, Meyle	$30-60
Rear Trailing Arm Bushing (RTABs Pair)	33326770824	Lemforder, Powerflex PFR5-3608	$60-120
Rear Upper Control Arm (Camber)	33326767832	Lemforder, SPC adjustable	$45-90
Rear Lower Control Arm	33326763479	Lemforder, Meyle	$35-70

Tools Needed

Floor jack and jack stands (4)
18mm, 19mm, 21mm sockets and wrenches
Ball joint separator
Tie rod end puller
Breaker bar
Torque wrench (ft-lb range)
Penetrating oil
RTAB press tool or hydraulic press
Spring compressor
Alignment specs printout

Procedure

Raise vehicle and support on jack stands at all four corners.
Remove all wheels and photograph suspension for reference.
Soak all suspension bolts with penetrating oil before removal.
Begin with front suspension - remove sway bar end links (44 ft-lbs torque spec).
Remove tie rod end nut (52 ft-lbs) and separate from knuckle using puller.
Remove lower control arm ball joint nut and separate from knuckle (122 ft-lbs).
Remove control arm bracket bolts from subframe (74 ft-lbs) and remove arm.
Remove thrust arm bolts - 74 ft-lbs at subframe, 122 ft-lbs at knuckle.
For struts: mark camber position, remove upper mount nuts (25 ft-lbs), remove pinch bolt (60 ft-lbs).
Use spring compressor to disassemble strut and replace mount/bearing.
Install new front components with correct torque specs.
For rear suspension: support trailing arm before removing bolts.
For RTAB replacement: remove trailing arm rear bolt, press out old bushings.
Press new RTABs into trailing arm - note orientation.
Remove and replace rear control arms as needed.
Reassemble all components - torque bushings at ride height.
Install wheels and lower vehicle - bounce corners to settle.
Professional 4-wheel alignment required immediately.

Pro Tips

E90 RTABs are critical for rear-end stability - prioritize if worn.
The E90 uses similar suspension to E46 but with updated components.
Meyle HD bushings are recommended for longer service life.
Consider replacing both front thrust arms even if only one shows wear.
The E92 M3 uses a different rear subframe design - verify part compatibility.

⚠️ Warnings

RTAB replacement requires a special press tool - don't attempt with hammers.
Worn RTABs cause dangerous rear-end instability - don't delay repairs.
Spring compressors are dangerous - follow tool instructions exactly.
Never strike ball joints directly - use proper separator tools.
M3 models have unique suspension components - verify correct parts.

References

Rust Prevention and Inspection

Intermediate 4-20+ hours $100-1,500+

Rust inspection guide for the E90, covering known problem areas and preventive treatments for this generally well-protected chassis.

Interval Inspect annually

Cost (DIY) $100-1,500+

Labor Varies by severity

Parts List

Part	OEM Number	Aftermarket	Est. Cost
Rocker Panel (Left)	41217152735	Klokkerholm, aftermarket	$120-280
Rocker Panel (Right)	41217152736	Klokkerholm, aftermarket	$120-280
Rear Wheel Arch (Left)	41357119211	Aftermarket	$100-220
Rear Wheel Arch (Right)	41357119212	Aftermarket	$100-220
Door Bottom Patch	—	Fabricated	$30-80
Jack Point Reinforcement	—	Fabricated	$30-80
Rust Converter	—	POR-15, Eastwood	$20-40
Cavity Wax	—	Fluid Film, Eastwood	$15-30
Epoxy Primer	—	Eastwood, SPI	$30-60
Seam Sealer	—	3M, Eastwood	$15-25

Tools Needed

Inspection mirror and flashlight
Wire brush and wire wheel
Angle grinder with flap disc
MIG welder (if repairs needed)
Sandpaper (80-320 grit)
Primer and paint supplies
Safety glasses and respirator
Fire extinguisher
Spray wand for cavity wax

Procedure

E90s are well-protected but still require inspection, especially salt-belt cars.
Clean undercarriage thoroughly before inspection.
Inspect rocker panels by tapping with screwdriver - soft spots indicate rust.
Check jack points for rust perforation - common failure point.
Inspect rear wheel arches from inside trunk and behind liners.
Check door bottoms by opening fully and inspecting from below.
Examine front fender mounting lips where mud collects.
Look at subframe mounting areas for any corrosion.
For surface rust: wire brush to bare metal, apply rust converter.
Prime with epoxy primer, then topcoat.
For rust-through: cut out damaged metal, weld in patches.
Seal all repaired areas with seam sealer.
Apply cavity wax to all hollow sections - rockers, frame rails.
Treat inner fenders and underbody with rust preventive.
Check sunroof drains if equipped - clogs cause interior rust.
Ensure all drain plugs are clear in floor and trunk.
Document condition for future reference.

Pro Tips

E90s are generally more rust-resistant than earlier BMWs due to better galvanization.
Most rust issues are from stone chips, salt, and debris rather than design flaws.
Annual Fluid Film application prevents most rust development.
Check behind plastic fender liners - they trap moisture.
Convertible E93 models may have additional rust points around top mechanism.

⚠️ Warnings

Always wear respirator when grinding rust.
Check for brake lines and wiring before welding.
Fire extinguisher must be accessible during any welding.
Structural rust near suspension mounts requires professional attention.
Don't ignore small rust spots - they spread quickly.

References

Electrical System Service

Intermediate 8-14 hours $300-800

Complete electrical system service covering the E90's common issues including ignition coils, VANOS solenoids, battery registration, and module coding.

Interval Address as symptoms appear

Cost (DIY) $300-800

Labor 6-10 hours shop time

Parts List

Part	OEM Number	Aftermarket	Est. Cost
Ignition Coil (N52/N54/N55)	12138616153	Bosch, Delphi	$30-50 each
VANOS Solenoid (Pair)	11367585425	Genuine BMW recommended	$150-300
Battery (AGM)	61217604822	Exide, Optima	$200-350
Eccentric Shaft Sensor (N52)	11377524879	Genuine BMW	$150-250
Crankshaft Position Sensor	13627525015	Bosch, VDO	$40-80
Camshaft Position Sensor	13627525014	Bosch, VDO	$40-80
HVAC Blend Door Actuator	64119321034	VDO, aftermarket	$60-120
Window Regulator (Front)	51337140587/88	URO, aftermarket	$70-130
Charge Pipe (N54/N55)	11617563716	BMS, aluminum upgrade	$80-200
Fuel Injector Seal Kit	13647599877	Aftermarket kit	$30-60

Tools Needed

ISTA/INPA diagnostic software or compatible tool
Torx driver set (T20, T25, T30)
10mm socket
Spark plug socket
Trim removal tools
Multimeter
Battery registration tool
Soldering iron (for module repair)
Contact cleaner
Dielectric grease

Procedure

Disconnect battery and wait 10 minutes before electrical work.
Start with diagnostic scan - E90s require proper software for full diagnosis.
For ignition coil replacement: remove engine cover, disconnect coil connectors.
Remove 10mm bolt, pull coils straight up, install new coils.
For VANOS solenoid replacement: locate solenoids on cylinder head.
Disconnect connector, remove mounting bolt, replace O-rings on new solenoid.
For battery replacement: note that E90 requires registration in DME.
Remove old battery, install new, register using ISTA or compatible tool.
Unregistered battery causes improper charging and reduced battery life.
For eccentric shaft sensor (N52): located on rear of cylinder head.
Remove electrical connector and sensor bolt, install new with fresh seal.
For blend door actuator: remove glovebox for access.
Disconnect actuator connector, remove mounting screws, install new.
Clean all electrical grounds and apply dielectric grease.
Clear fault codes and perform adaptation reset as needed.
Test all systems thoroughly after repairs.

Pro Tips

E90 requires proper diagnostic software - generic OBD2 scanners miss many faults.
Battery MUST be registered after replacement or it will overcharge and fail early.
Ignition coil failure is common - misfires often traced to coils.
VANOS solenoids should be OEM - aftermarket quality varies significantly.
The N54 engine has many electrical components - systematic diagnosis is key.

⚠️ Warnings

Always disconnect battery before electrical work.
Battery registration is mandatory - skipping causes charging system issues.
N54/N55 charge pipe can blow off under boost - upgrade to aluminum recommended.
Don't clear fault codes without documenting them first.
SRS (airbag) system requires special procedures - don't probe these circuits.

References

Interior Restoration

Intermediate 10-18 hours $250-900

Complete interior refresh for the E90 covering leather care, trim restoration, iDrive service, and common wear items.

Interval As needed for wear items

Cost (DIY) $250-900

Labor 8-14 hours shop time

Parts List

Part	OEM Number	Aftermarket	Est. Cost
Leather Repair Kit	—	Leatherique, Colourlock	$50-100
Headliner Fabric (3 yards)	—	OEM-match foam-backed	$40-80
Headliner Adhesive	—	3M Super 77, Permatex	$15-25
Aluminum Trim Wrap/Refinish	—	3M vinyl, hydrodip	$30-100
Shift Knob (Manual)	25117566267	Aftermarket, BMW Performance	$50-150
iDrive Controller (CCC/CIC)	65826944883	Used OEM, rebuilt	$150-400
Door Panel Clip Set	51417144334	URO, aftermarket	$10-25
Cabin Air Filter	64319142115	Mann CUK2533, Bosch	$25-50
Seat Foam (Driver Bolster)	52107122530	Recovered, aftermarket	$80-180
Door Seal Set	51727143847	URO, aftermarket	$100-200

Tools Needed

Trim removal tools (plastic pry set)
Torx driver set (T15, T20, T25, T30)
Phillips and flathead screwdrivers
Heat gun
Adhesive scraper
Microfiber cloths
Leather cleaner and conditioner
Interior detailing brushes
ISTA diagnostic for iDrive coding

Procedure

Document all components with photos before disassembly.
Remove seats for access - 4 bolts each, disconnect electrical connectors.
For leather: clean with dedicated leather cleaner in small sections.
Address cracks with leather filler, sand smooth, apply dye.
Condition all leather surfaces after repair.
For headliner: remove sun visors, dome lights, A-pillar trim, grab handles.
Remove headliner board through rear door opening.
Strip old fabric and foam, apply new fabric from center outward.
For aluminum trim: options include re-brushing, vinyl wrap, or hydrodip.
If peeling, vinyl wrap provides durable finish without disassembly.
For iDrive: diagnose controller vs screen issues with proper scanner.
Controller rebuild services available for sticky buttons or failed scroll.
Replace cabin air filter - accessed behind glovebox.
Clean all HVAC vents with detailing brushes.
Replace door seals if wind noise present.
Apply UV protectant to dashboard and trim.
Reassemble in reverse order.

Pro Tips

E90 aluminum trim peels and flakes - vinyl wrap is popular solution.
Sport seats have aggressive bolsters that wear faster.
iDrive controller failures are common - rebuilds available.
The E90 uses Dakota leather on most models - responds well to conditioning.
Check for sunroof drain clogs if headliner shows water stains.

⚠️ Warnings

Headliner adhesive fumes are harmful - work in well-ventilated area.
E90 seats have side airbags - disconnect battery before removal.
Don't force trim clips - they break easily when cold.
iDrive coding requires proper software - incorrect coding causes issues.
Test all electrical after seat reinstallation - connectors can be fragile.

References

Parts & Suppliers

Trusted sources for OEM, aftermarket, and used parts

OEM Featured

FCP Euro

Lifetime replacement guarantee. Essential for water pumps, turbos, and HPFP parts.

Lifetime Warranty OE Quality

Free over $49 Lifetime

OEM

Pelican Parts

E90/E92 catalog with excellent DIY tech articles.

Tech Articles OE Parts

Free over $99

OEM

BMW Parts Direct

Genuine BMW OEM parts from authorized dealers.

Genuine BMW Dealer Direct

Performance Featured

Burger Motorsports

N54/N55 performance specialists. JB4 tuning, downpipes, and intakes.

N54/N55 Tuning JB4 Intakes

Performance

Pure Turbos

Upgraded turbo units for N54 335i. Stage 1-3 options.

Upgraded Turbos N54 Big Power

Performance

Turner Motorsport

Race-proven E90 M3 and 335i performance parts.

M3 Parts Suspension Brakes

Performance

BimmerWorld

Track-focused parts with racing pedigree.

Track Parts Suspension

Performance

Dinan

Premium BMW performance with warranty-friendly software and hardware.

Software Exhaust Premium

General

ECS Tuning

Large E90 inventory. Great for maintenance and N54/N55 parts.

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AutohausAZ

Competitive prices on name brand parts.

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Free over $50

Specialist Featured

Vargas Turbo Technologies

N54/N55 turbo specialists. Rebuild services and upgraded turbos.

Turbo Rebuilds N54/N55

Specialist

MHD Flasher

DIY N54/N55 ECU tuning via smartphone app.

ECU Tuning DIY Flashing

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Largest E90 community marketplace.

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eBay Motors

Large selection including M3 and 335i performance parts.

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Car-Part.com

Search salvage yard inventory nationwide.

Salvage Yards Body Parts

Helpful Tools

RealOEM Free BMW parts diagrams and part number lookup E90Post Wiki E90 technical wiki and DIY guides

Torque Specifications

Factory torque values for common service items

Reference Sources

Engine

Component	Torque Spec	Notes
Cylinder Head Bolts (N52)	30 ft-lbs (40 Nm) + 90° + 90°	TTY bolts, replace each use
Cylinder Head Bolts (N54/N55)	30 ft-lbs (40 Nm) + 90° + 90°	TTY bolts, replace each use
Spark Plugs (N52)	17 ft-lbs (23 Nm)	-
Spark Plugs (N54/N55)	17 ft-lbs (23 Nm)	No anti-seize needed
Valve Cover Bolts (N52)	9 ft-lbs (12 Nm)	Specific sequence required
Oil Drain Plug	18 ft-lbs (25 Nm)	Replace crush washer
Oil Filter Housing Bolts	18 ft-lbs (25 Nm)	-
Intake Manifold (N52)	7 ft-lbs (10 Nm)	-
Charge Pipe Clamps (N54/N55)	5 ft-lbs (7 Nm)	-
Turbo Oil Feed Line (N54)	15 ft-lbs (20 Nm)	-
Exhaust Forward Flanges (N54)	15 ft-lbs (21 Nm)	Turbo engine only

Suspension

Component	Torque Spec	Notes
Wheel Lug Bolts	89 ft-lbs (120 Nm)	Tighten in star pattern, dry torque
Control Arm to Knuckle	122 ft-lbs (165 Nm)	-
Control Arm to Subframe	74 ft-lbs (100 Nm)	-
Tension Strut (Thrust Arm) to Knuckle	122 ft-lbs (165 Nm)	-
Tension Strut to Subframe	74 ft-lbs (100 Nm)	-
Strut Pinch Clamp	60 ft-lbs (81 Nm)	-
Strut Top Nut	25 ft-lbs (34 Nm)	-
Tie Rod Nut	52 ft-lbs (70 Nm)	-
Sway Bar End Links (Front)	44 ft-lbs (60 Nm)	-
Sway Bar End Links (Rear)	43 ft-lbs (58 Nm)	-
Sway Bar Bracket to Subframe	16 ft-lbs (21 Nm)	M8 bolts
Subframe Reinforcement Plate	44 ft-lbs (59 Nm) + 90° ± 30°	8 Torx bolts, new bolts required

Brakes

Component	Torque Spec	Notes
Front Caliper Carrier	81 ft-lbs (110 Nm)	-
Rear Caliper Carrier	48 ft-lbs (65 Nm)	-
Caliper Guide Pins	22 ft-lbs (30 Nm)	-
Brake Line to Hose	9 ft-lbs (12 Nm)	-
Brake Rotor Set Screw	12 ft-lbs (16 Nm)	Use thread locker
Pad Wear Sensor	Hand tight	Clips into place

DIY Maintenance Guides

Step-by-step tutorials for common maintenance tasks

Oil Change

Easy 30 min $60-90

Complete oil and filter change for N52, N54, and N55 engines.

Interval Every 7,500-10,000 miles

Cost (DIY) $60-90

Tools Needed

17mm socket for drain plug
36mm socket or oil filter cap wrench
Drain pan
Funnel
Jack and jack stands
Torque wrench

Procedure

Warm the engine for 2-3 minutes to thin the oil.
Raise the front of the car and secure on jack stands, or use ramps.
Locate the oil drain plug on the oil pan - passenger side.
Position drain pan and remove the 17mm drain plug.
Allow oil to drain completely - 10 minutes minimum.
Replace the aluminum crush washer on the drain plug.
Reinstall drain plug and torque to 18 ft-lbs (25 Nm).
The oil filter housing is on top of the engine - remove cap with 36mm socket.
Lift out the old filter element and remove the O-ring from the cap.
Install the new filter element onto the center post.
Lubricate the new O-ring with fresh oil and seat it in the cap groove.
Reinstall the filter cap and torque to 25 ft-lbs (34 Nm).
Add oil: 6.5 quarts (N52), 7.0 quarts (N54/N55). Use 5W-30 BMW LL-01.
Start engine, check for leaks, shut off and verify level after 2 minutes.

Pro Tips

The E90 uses a cartridge filter - the housing stays on the engine.
Always replace the O-ring to prevent leaks from the filter housing cap.
N54/N55 turbo engines benefit from 0W-40 in extreme temperatures.

Brake Pad Replacement

Easy 1-2 hours $80-150

Front and rear brake pad replacement with electronic sensor reset.

Interval Every 25,000-50,000 miles

Cost (DIY) $80-150

Tools Needed

17mm socket for lug bolts
7mm Allen socket for caliper pins
T30 Torx for wear sensor
Brake piston tool or C-clamp
Wire brush
Brake cleaner
Brake grease
Diagnostic tool for CBS reset (optional)

Procedure

Loosen lug bolts while the car is on the ground.
Raise and support the car on jack stands, remove wheel.
Disconnect the brake pad wear sensor connector and unclip from bracket.
Remove the two 7mm Allen caliper guide pin bolts from behind the caliper.
Pivot the caliper up and secure - do not let it hang by the brake hose.
Remove the old pads from the caliper bracket.
Inspect rotor for wear, grooves, or minimum thickness markings.
Clean the pad contact surfaces with wire brush and brake cleaner.
Open brake fluid reservoir cap, then compress caliper piston fully.
Apply brake grease to the back of new pads and contact points.
Install new pads - the pad with wear sensor hole goes on the inner side.
Install new wear sensor into the inner pad (sensors are typically one-time use).
Pivot caliper down and reinstall guide pins to 22 ft-lbs (30 Nm).
Reconnect wear sensor, reinstall wheel, torque lugs to 89 ft-lbs (120 Nm).
Reset brake pad wear indicator using ISTA or compatible diagnostic tool.

Pro Tips

E90 electronic wear sensors are usually on front left and rear right.
After replacement, reset the CBS (Condition Based Service) brake indicator.
Bed new pads with 5-10 moderate stops from 30 mph before driving normally.

Spark Plug Replacement

Easy 1-2 hours $60-120

Spark plug replacement for all E90 engine variants.

Interval Every 60,000 miles (N52) or 45,000 miles (N54/N55)

Cost (DIY) $60-120

Tools Needed

10mm socket
T30 Torx
Spark plug socket (5/8" or 14mm thin-wall)
6" extension
Torque wrench
Compressed air or vacuum
Anti-seize (optional - some plugs pre-applied)

Procedure

Allow engine to cool completely - spark plugs can seize in hot aluminum.
Remove the engine cover by pulling up on the four corners.
Disconnect the electrical connector from each ignition coil.
Remove the 10mm bolt or T30 screw holding each coil in place.
Pull each ignition coil straight up and out of the spark plug well.
Use compressed air or vacuum to clean debris from the spark plug wells.
Using spark plug socket and extension, remove each spark plug.
Inspect old plugs for wear, fouling, or damage - note condition.
Gap new plugs if necessary (most modern plugs are pre-gapped).
Thread new plugs in by hand to prevent cross-threading.
Torque spark plugs to 17 ft-lbs (23 Nm) - do not overtighten.
Reinstall ignition coils and secure with bolt/screw.
Reconnect coil electrical connectors until they click.
Reinstall engine cover.

Pro Tips

N54 uses 6 spark plugs; the N52 uses 6 spark plugs - one per cylinder.
Use NGK or Bosch OEM-equivalent plugs for best results.
Inspect ignition coils while replacing plugs - replace if cracked or worn.

Oil Filter Housing Gasket

Intermediate 2-3 hours $30-60

Replace the notorious leaking oil filter housing gasket.

Interval As needed (common leak point)

Cost (DIY) $30-60

Tools Needed

36mm socket for filter cap
E10, E12 Torx sockets
10mm socket
Flathead screwdriver
Gasket pick
Clean rags
New gasket kit
Fresh oil for top-off

Procedure

Remove the engine cover and intake snorkel for access.
Drain some coolant - the oil cooler (if equipped) ties into the cooling system.
Remove the oil filter cap and filter element.
Disconnect any electrical connectors on or near the housing (oil pressure sensor).
Remove the 3-4 E10 or E12 Torx bolts holding the filter housing to the block.
Carefully pry the housing off the block - it may stick from the old gasket.
Remove the old gasket and clean both mating surfaces thoroughly.
Remove old O-rings from the oil cooler ports if equipped.
Install new gasket onto the housing - it should seat into the groove.
Install new oil cooler O-rings if equipped.
Position housing on block and hand-thread the mounting bolts.
Torque mounting bolts to 18 ft-lbs (25 Nm) in a cross pattern.
Reinstall filter element and cap, torque cap to 25 ft-lbs (34 Nm).
Reconnect electrical connectors and refill coolant if drained.
Start engine and check for leaks at the housing.

Pro Tips

The OFHG is one of the most common oil leaks on N52 and N54 engines.
Oil dripping onto the exhaust can cause smoke and fire - don't delay this repair.
Some kits include the oil cooler gaskets - inspect and replace if questionable.
Check the eccentric shaft sensor seal (N52) while you have access.

Community Resources

Popular YouTube channels, forums, and communities dedicated to the E90

BMW E90/E91/E92/E93 3 Series

Buyer's Guide

Overview

Quick Facts

Model Variants

325i / 328i

335i

335is

M3 (E90/E92/E93)

328xi / 335xi

Pre-Purchase Inspection Checklist

Engine (N54 335i)

Engine (S65 M3)

Cooling & Electrical

Suspension & Drivetrain

Body & Interior

Pricing Guide

Project Car

Driver Quality

Excellent

Concours / Collector

Red Flags - Walk Away If...

What to Look For

Ownership Costs

Expert Tips

Common Issues

Electric Water Pump and Thermostat Failure

Estimated Repair Costs

Common Fixes

Common Parts

Oil Leaks (Valve Cover and Oil Filter Housing)

Estimated Repair Costs

Common Fixes

Common Parts

High Pressure Fuel Pump Failure (N54/N55)

Estimated Repair Costs

Common Fixes

Common Parts

Fuel Injector Problems (N54/N55)

Estimated Repair Costs

Common Fixes

Common Parts

VANOS Solenoid and System Issues

Estimated Repair Costs

Common Fixes

Common Parts

Similar Issue On Other Models

Turbo Wastegate Rattle (N54)

Estimated Repair Costs

Common Fixes

Common Parts

Carbon Buildup on Intake Valves (Direct Injection Engines)

Estimated Repair Costs

Common Fixes

Common Parts

Rod Bearing Wear (S65 M3)

Estimated Repair Costs

Common Fixes

Common Parts

Timing Chain and Guide Issues (N20/N54/N55)

Estimated Repair Costs

Common Fixes

Common Parts

Restoration Guides

Complete Suspension Refresh

Parts List

Tools Needed

Procedure

Pro Tips

⚠️ Warnings

References

Rust Prevention and Inspection

Parts List

Tools Needed

Procedure

Pro Tips

⚠️ Warnings

References

Electrical System Service

Parts List