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Knock Sensor

The knock sensor senses the vibrations caused by spark detonation (engine knock or ping) and transmits this data to the engine control computer.

Symptoms of Wear or Failure

  • Poor acceleration
  • Pinging or knocking sound during acceleration
  • Check Engine Light may come on
  • Poor gas mileage

Related Repair Advice

  • If an engine has multiple knock sensors, it may be recommended to replace them as a set
  • When replacing a knock sensor, it is critical the new sensor be properly tightened to the factory specification
  • Only use factory OEM knock sensors and be sure to check for any relevant Technical Service Bulletins (TSBs), necessary software updates, and re-calibration procedures
  • A knock sensor code isn't always triggered by a defective knock sensor. It can be triggered by a malfunctioning EGR system, a lean air-to-fuel ratio, worn ignition components, a cooling system problem, or an engine mechanical problem.

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