P1237 – Engine Load Calculation Fault (BMW)

Description

P1237 BMW indicates the ECU cannot calculate engine load correctly.

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Symptoms

  • Poor acceleration
  • Hesitation
  • Rough idle

Causes

  • MAF failure
  • Air leak
  • Sensor drift

Diagnosis

  • Check MAF readings
  • Inspect intake
  • Scan DME

Repair

  • Replace MAF
  • Fix intake leaks
  • Replace sensor