Skip to content

P0304 on BMW — Cylinder 4 Misfire Detected

BMW

Verified1 source
1 source
  • Official data (NHTSA)official_feed

What P0304 means

Avoid long trips

A misfire is detected specifically in cylinder 4. As the fault is confined to this one cylinder, the diagnostic path targets cylinder 4's coil, plug, and injector; on BMW engines compression and injector-flow checks on cylinder 4 help separate an ignition fault from a mechanical or fuelling cause before parts are replaced.

Driveability assessment not yet available. Get a personalized AI Second Opinion for your exact car.

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

Common causes

  • Cylinder 4 spark plug or coil

Symptoms

  • Повышенный расход топлива
  • Engine misfiring

What to check first

  1. Swap-test coil/plug on cylinder 4
  2. Inspect spark well for oil
Cost data coming soonUpload your estimate to check if the price is fair
Was this page helpful?