P1235 – Load Signal Fault (BMW)

Description

P1235 BMW indicates a fault in the engine load signal.

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Symptoms

  • Poor acceleration
  • Hesitation
  • Rough idle

Causes

  • MAF failure
  • Air leak
  • ECU logic issue

Diagnosis

  • Check load values
  • Inspect intake
  • Scan DME

Repair

  • Replace MAF
  • Fix intake leaks
  • Update ECU

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