P1046 – Airflow Plausibility Fault (BMW)

Description

P1046 BMW indicates the measured airflow does not match expected engine load.

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Symptoms

  • Poor acceleration
  • Hesitation
  • Rough idle

Causes

  • MAF sensor fault
  • Air leak
  • Throttle issue

Diagnosis

  • Check MAF readings
  • Inspect intake leaks
  • Scan DME

Repair

  • Replace MAF
  • Fix intake leaks
  • Repair throttle body