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P0303 on BMW — Cylinder 3 Misfire Detected

BMW

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1 source
  • Official data (NHTSA)official_feed

What P0303 means

Avoid long trips

A misfire is detected specifically in cylinder 3. Because the fault is isolated to one cylinder, diagnosis focuses on that cylinder's ignition coil, spark plug, and fuel injector — a common BMW check is to swap the coil or injector from cylinder 3 to a neighbour and see whether the misfire follows the part.

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General information, not a diagnosis or repair instruction. Always confirm with a qualified mechanic for your specific vehicle.

Common causes

  • Cylinder 3 spark plug or coil

Symptoms

  • Повышенный расход топлива
  • Engine misfiring

What to check first

  1. Swap-test coil/plug on cylinder 3
  2. Inspect spark well for oil
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