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2011 BMW M3 E90
4.0L V8 S65•RWD•DCT•gas
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Repairs0Labor493Torque3437Fluid8DTC1088Battery1Maintenance0Recalls0
29CEhigh severityPowertrain

Misfire Cylinder 3

on 2011 BMW M3 E90 4.0L V8 S65 · RWD

What this code means

The engine control module detected a misfire on cylinder 3, meaning combustion is not completing properly. This is the BMW equivalent of OBD code P0303.

Symptoms

  • Rough idle
  • Engine hesitation
  • Check engine light flashing

Common causes

  • Faulty ignition coil
  • Worn spark plug
  • Fuel injector fault
  • Low compression or vacuum leak

Diagnostic steps

  1. Read freeze frame and confirm cylinder 3 misfire
  2. Swap coil and plug to another cylinder
  3. Test injector operation on cylinder 3
  4. Perform compression test on cylinder 3
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