P1047 – Air Mass Signal Too Low (BMW)

Description

P1047 BMW indicates the air mass signal is lower than expected.

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Symptoms

  • Rough idle
  • Hesitation
  • Poor acceleration

Causes

  • MAF contamination
  • Air leak
  • Sensor failure

Diagnosis

  • Check MAF signal
  • Inspect intake
  • Clean sensor

Repair

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