P1128 – Fuel Trim Adaptation High (BMW)

Description

P1128 BMW indicates the fuel trim adaptation value is higher than expected.

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Symptoms

  • High fuel trims
  • Rough idle
  • Hesitation

Causes

  • Vacuum leak
  • MAF contamination
  • Weak fuel pump

Diagnosis

  • Check fuel trims
  • Inspect vacuum lines
  • Test fuel pressure

Repair

  • Fix vacuum leaks
  • Clean MAF
  • Repair fuel system