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2022 BMW M550I
4.4L V8 Twin-Turbo N63•AWD•AUTOMATIC•gas•turbo
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Repairs0Labor485Torque3385Fluid8DTC1489Battery1Maintenance0Recalls0
29CFhigh severityPowertrain

Misfire Cylinder 4

on 2022 BMW M550i 4.4L V8 Twin-Turbo N63 · AWD

What this code means

The engine control module detected a misfire on cylinder 4, indicating a combustion problem in that cylinder. This is the BMW equivalent of OBD code P0304.

Symptoms

  • Rough idle
  • Reduced power
  • 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 4 misfire
  2. Swap coil and plug to another cylinder
  3. Test injector operation on cylinder 4
  4. Perform compression test on cylinder 4
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