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E90 N43
BMW 3 Series · Sedan · 2005–2011
The 3-series that made naturally aspirated and twin-turbo inline sixes mainstream.
Production run
2005–2011
Engines covered
8
Avg. part price
—
19902026
Interactive systems map
Inspect the E90 N43
Tap a hotspot to inspect that system
Systems map
Where it goes wrong
Each numbered hotspot counts the documented failure points in that area. Select one to see the specifics for this chassis and engine.
Failure points by system
Engine3
Cooling4
Intake2
Fuel5
Electrical1
Exhaust4
Documented issues per engine
4N52
4N51
4N53
4N54
4N55
0N43
4M57
4N47
Known weak points
What breaks on the E90 N43
Valve cover gasket oil leaksDiagnose →Electric water pump failureDiagnose →Same as N52 plus extra emissions hardwareDiagnose →Water pumpDiagnose →Injector failuresDiagnose →NOx sensor faultsDiagnose →HPFP failure / long crankDiagnose →Injector leaks and misfiresDiagnose →Plastic charge pipe crackingDiagnose →Oil filter housing gasket leakDiagnose →Swirl flap failure (early)Diagnose →EGR cooler leaksDiagnose →Timing chain at the rear of the block (major job)Diagnose →EGR coolerDiagnose →
Guides & playbooks
E90 N43 playbooks
Maintenance scheduleGive me a mileage-based maintenance schedule for a BMW 3 Series E90 N43, including the items the factory schedule skips.Buyer's inspectionI'm inspecting a used BMW 3 Series E90 N43. What exactly should I check, test drive and look for underneath?Build planPlan a staged performance build for a BMW 3 Series E90 N43 that stays reliable as a daily driver.Fault code lookupI have a fault code on my BMW 3 Series E90 N43. Walk me through what it means and how to confirm the cause.
Fits your E90 N43
Parts & tools
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