P1109 – Airflow Adaptation Fault (BMW)

Description

P1109 BMW indicates the ECU cannot adapt airflow values correctly.

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Symptoms

  • Rough idle
  • High fuel trims
  • Hesitation

Causes

  • Air leak
  • MAF contamination
  • Sensor drift

Diagnosis

  • Check fuel trims
  • Inspect intake
  • Test MAF

Repair

  • Fix intake leaks
  • Clean or replace MAF
  • Replace sensor

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