P1223 – Knock Sensor Signal Low (BMW)

Description

P1223 BMW indicates the knock sensor signal is lower than expected.

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Symptoms

  • Rattling under load
  • Hesitation
  • Engine noise

Causes

  • Sensor failure
  • Loose mounting
  • Wiring issue

Diagnosis

  • Check sensor voltage
  • Inspect mounting
  • Check wiring

Repair

  • Replace sensor
  • Retorque sensor
  • Repair wiring