P1025 – VANOS Intake Timing Over‑Retarded (BMW)

Description

P1025 BMW indicates the intake camshaft timing is more retarded than commanded.

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Symptoms

  • Poor acceleration
  • Hesitation
  • Rough idle

Causes

  • Solenoid failure
  • Oil pressure issue
  • Timing chain stretch

Diagnosis

  • Check timing values
  • Inspect solenoid
  • Check oil pressure

Repair

  • Replace solenoid
  • Repair timing components
  • Fix oil pressure faults