BMW N54 engine report
BMW N54 · 335i (E90/E92)
3.0 LPetrolInline-62009–2010
48/100
[risky]
Fast, but only for buyers with deep pockets and full records
Worth buying, but only on the right car. Records showing the high-pressure fuel pump, water pump and injectors have been replaced, and an inspection that finds no wastegate rattle and no oil leaks.
ExcellentGoodSolidRiskyAvoid
- Known issues
- 14
- Critical
- 3
- Sources
- 99
Verdict
The high-pressure fuel pump is the part to budget for, because it fails very often on this engine.
A car that has already had a new one is worth more to you. The water pump is common too and worth replacing before it goes, and you should expect oil leaks from seals and gaskets and the odd injector on a car this old. Rod bearings, oil pump wear, the head gasket and the turbos fail rarely, but they are why the inspection and the service history count for more than the badge. Worn fuel parts are part of owning one, not bad luck.
Specs
- Displacement
- 3.0 L2,979 cc
- Layout
- Inline-6
- Fuel
- Petrol
- Production
- 2006 – 2016
- Chassis
- E90/E92
- Generation
- LCI
- Fitted
- 2009–2010
Known issues
14 confirmed · sorted by severity
CriticalOil pump wear / sludge buildup
Oil pump wear or sludge accumulation (often from extended oil-change intervals) reducing oil pressure and lubrication.
Symptoms
- Warning Light
- Knocking Noise
How often
Rare · Owner-caused. Can destroy the engine if ignored. Not safely drivable.
Evidence
7 owner reports back this, confidence 50/100.
CriticalRod bearing failure
Connecting rod (big end) bearing wear or spun bearing, usually from oil starvation or extended oil-change intervals -- can destroy the engine if not caught early.
Symptoms
- Knocking Noise
- Warning Light
How often
Rare · Design weakness. Can destroy the engine if ignored. Not safely drivable.
Evidence
6 owner reports back this, confidence 50/100.
CriticalHead gasket failure
Head gasket failure, often preceded by overheating; can lead to a warped head or cracked block if not addressed.
Symptoms
- Coolant Loss
- Smoke (White/Blue/Black)
- Warning Light
How often
Very rare · Design weakness. Can destroy the engine if ignored. Not safely drivable.
Evidence
5 owner reports back this, confidence 50/100.
HighHigh-pressure fuel pump failure
HPFP wear or failure, sometimes shedding metal debris into the fuel system.
Symptoms
- Misfire
- Warning Light
- Hesitation
How often
Very common · Design weakness. Does not normally destroy the engine. Not safely drivable.
Evidence
119 owner reports back this, confidence 50/100.
HighTurbocharger failure
Turbo bearing/shaft wear, oil seal failure, or surge damage, often linked to oil starvation or carbon buildup.
Symptoms
- Power Loss
- Smoke (White/Blue/Black)
- Whining Noise
How often
Very rare · Design weakness. Does not normally destroy the engine. Still drivable.
Evidence
5 owner reports back this, confidence 45/100.
ModerateWater pump failure
Water pump seal or bearing failure (mechanical or electric pump), causing coolant loss.
Symptoms
- Coolant Loss
- Warning Light
How often
Common · Design weakness. Does not normally destroy the engine. Still drivable.
Evidence
28 owner reports back this, confidence 50/100.
ModerateDual-mass flywheel / clutch wear
Dual-mass flywheel wear causing rattle/vibration, often coinciding with clutch replacement interval.
Symptoms
- Excessive Vibration
- Knocking Noise
How often
Very rare · Expected maintenance. Does not normally destroy the engine. Still drivable.
Evidence
2 owner reports back this, confidence 45/100.
LowOil leak from seals or gaskets
Valve cover gasket, rear main seal, or front main seal degradation causing external oil leaks.
Symptoms
- Oil Consumption
How often
Occasional · Design weakness. Does not normally destroy the engine. Still drivable.
Evidence
21 owner reports back this, confidence 65/100.
LowFuel injector failure
Injector wear, sticking, or seal failure causing misfires, rough running, or fuel leaks.
Symptoms
- Misfire
- Rough Idle
- Fuel Smell
How often
Occasional · Design weakness. Does not normally destroy the engine. Still drivable.
Evidence
13 owner reports back this, confidence 50/100.
LowWastegate / boost actuator failure
Wastegate, boost control actuator, or diverter/blow-off valve failure causing boost leaks or inconsistent boost pressure.
Symptoms
- Reduced Power Mode
- Turbo Lag
How often
Occasional · Design weakness. Does not normally destroy the engine. Still drivable.
Evidence
13 owner reports back this, confidence 50/100.
LowECU fault or wiring issue
ECU hardware fault or injector wiring loom degradation causing misfires or no-start conditions.
Symptoms
- Warning Light
- Misfire
How often
Rare · Manufacturing defect. Can destroy the engine if ignored. Still drivable.
Evidence
8 owner reports back this, confidence 50/100.
LowThermostat / temperature sensor failure
Thermostat sticking open or closed, or temperature sensor drift, causing incorrect operating temperature.
Symptoms
- Warning Light
How often
Rare · Age-related wear. Does not normally destroy the engine. Still drivable.
Evidence
9 owner reports back this, confidence 50/100.
LowVariable valve timing solenoid/actuator failure
VANOS/VTEC/VVT-style variable valve timing solenoids or actuators fail or clog, causing rough idle, rattle on start, or reduced power.
Symptoms
- Rough Idle
- Reduced Power Mode
- Warning Light
How often
Rare · Design weakness. Does not normally destroy the engine. Still drivable.
Evidence
8 owner reports back this, confidence 50/100.
LowIntake valve carbon buildup
Direct-injection engines lack fuel washing the intake valves, leading to carbon buildup, misfires, and reduced power over time.
Symptoms
- Misfire
- Power Loss
- Rough Idle
How often
Very rare · Expected maintenance. Does not normally destroy the engine. Still drivable.
Evidence
4 owner reports back this, confidence 45/100.
- Critical
- High
- Moderate
- Low
High-pressure fuel pump failurefrom 129k km
Oil pump wear / sludge buildupfrom 150k km
Rod bearing failurefrom 129k km
Water pump failurefrom 129k km
Head gasket failurefrom 97k km
Oil leak from seals or gasketsfrom 155k km
Fuel injector failurefrom 283k km
Wastegate / boost actuator failurefrom 161k km
Showing the 8 highest-impact of 14 dated issues. The rest are in the list above.
Buying checklist
0 of 13 checked
Sources
Updated 11 Sept 2026 · scoring v2.7
Behind this report sit 99 owner posts, forum threads and official records. Nothing gets on the list on one person's word. It takes a recall, or owners on separate platforms describing the same fault. The score then sets how often a problem turns up against the damage it does.