P1222 – Knock Sensor Range/Performance (BMW)

Description

P1222 BMW indicates a range/performance fault in the knock sensor system.

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Symptoms

  • Rattling under load
  • Hesitation
  • Reduced power

Causes

  • Sensor degradation
  • Improper torque
  • Wiring issue

Diagnosis

  • Check sensor mounting
  • Inspect wiring
  • Scan DME

Repair

  • Retorque sensor
  • Replace sensor
  • Repair wiring