P1228 – Combustion Roughness Fault (BMW)

Description

P1228 BMW indicates rough combustion detected in one or more cylinders.

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Symptoms

  • Rough idle
  • Hesitation
  • Misfire

Causes

  • Ignition fault
  • Injector issue
  • Mixture imbalance

Diagnosis

  • Check misfire counters
  • Inspect ignition
  • Test injectors

Repair

  • Repair ignition
  • Service injectors
  • Fix mixture imbalance