P1227 – Cylinder Pressure Too High (BMW)

Description

P1227 BMW indicates cylinder pressure is higher than expected.

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Symptoms

  • Knocking noise
  • Hesitation
  • Reduced power

Causes

  • Excessive advance
  • High compression
  • Carbon buildup

Diagnosis

  • Check ignition timing
  • Inspect compression
  • Check for deposits

Repair

  • Adjust timing
  • Decarbonize engine
  • Repair mechanical issues