981 · Engine

P0300

Random/Multiple Cylinder Misfire Detected

HIGH SEVERITY

The DME detected misfires across multiple or random cylinders. Unburned fuel reaching the catalysts risks expensive converter damage.

SYMPTOMS

  • Flashing or steady check-engine light
  • Rough idle
  • Stumble
  • Power loss
  • Possible stall

LIKELY CAUSES

  • Worn coils or spark plugs
  • Vacuum/intake leak
  • Low fuel pressure
  • Lean condition
  • Injector fault

DIAGNOSIS STEPS

  • Read misfire counters per cylinder
  • Inspect plugs and coils
  • Check fuel pressure and fuel trims
  • Smoke-test for vacuum leaks

RELATED PARTS

  • Spark plugs
  • Ignition coils
  • Fuel injectors
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