P1224 – Knock Sensor Signal High (BMW)

Description

P1224 BMW indicates the knock sensor signal is higher than expected.

Want to confirm the real cause of this fault code?

A high‑quality OBD2 scanner gives you live data, fuel trims, sensor readings and freeze‑frame information — exactly what you need to verify the root cause of this code with confidence.

View Recommended Scanners

Symptoms

  • Hesitation
  • Reduced power
  • Misfire

Causes

  • Sensor failure
  • Mechanical noise
  • Wiring fault

Diagnosis

  • Check sensor voltage
  • Inspect engine noise
  • Check wiring

Repair

  • Replace sensor
  • Repair wiring
  • Investigate mechanical noise

Related Problems