P1004 – Valvetronic Reference Position Fault (BMW)

Description

P1004 BMW indicates the Valvetronic reference position cannot be learned or is invalid.

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Symptoms

  • Long crank
  • Rough idle
  • Reduced power

Causes

  • Adaptation failure
  • Sensor fault
  • Mechanical wear

Diagnosis

  • Perform adaptation
  • Check sensor values
  • Inspect mechanism

Repair

  • Reset adaptations
  • Replace sensor
  • Repair mechanical components