P1048 – Air Mass Signal Too High (BMW)

Description

P1048 BMW indicates the air mass signal is higher than expected.

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Symptoms

  • Rough idle
  • Hesitation
  • Reduced power

Causes

  • Sensor failure
  • Airflow restriction
  • Wiring fault

Diagnosis

  • Check MAF signal
  • Inspect intake
  • Check wiring

Repair

  • Replace sensor
  • Fix wiring
  • Repair intake