P1226 – Cylinder Pressure Too Low (BMW)

Description

P1226 BMW indicates cylinder pressure is lower than expected.

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Symptoms

  • Rough idle
  • Low power
  • Misfire

Causes

  • Worn piston rings
  • Valve leakage
  • Head gasket issue

Diagnosis

  • Perform compression test
  • Check leakdown
  • Inspect coolant/oil

Repair

  • Repair engine
  • Replace gasket
  • Service valves