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KNOCK SENSOR

The knock sensor is located on the outside of the engine block. It is intended to record knocking noise in all engine operating states in order to prevent engine damage.

The knock sensor is located on the outside of the engine block. It is intended to record knocking noise in all engine operating states in order to prevent engine damage. The knock sensor sends signals to the engine control unit (ECU) to adjust ignition timing and prevent potential engine damage. 

Causes of knock sensor failure:

  • Sensor damage: Physical damage to the knock sensor due to impact, corrosion, or excessive heat.
  • Electrical issues: Faulty wiring, loose connections, or damaged electrical components related to the knock sensor.
  • Contamination: The knock sensor may become contaminated with oil, coolant, or debris, affecting its performance.
  • Sensor aging: Over time, the knock sensor may wear out or become less sensitive, leading to failure.
  • Faulty ECU: In rare cases, a malfunctioning engine control unit can cause knock sensor problems.

Symptoms of a faulty knock sensor:

  • Check Engine Light (CEL) or Malfunction Indicator Lamp (MIL) illuminates.
  • Reduced engine performance or power loss.
  • Engine hesitation or stumbling during acceleration.
  • Poor fuel economy.
  • Abnormal engine noise, such as knocking or pinging sounds.
  • Difficulty starting the engine.
  • Increased emissions or failed emissions tests.
  • Detonation-related issues, such as engine overheating or damage.

It's important to note that some symptoms associated with a faulty knock sensor can also be caused by other engine or ignition system problems. Therefore, it's recommended to have the vehicle diagnosed by a qualified mechanic or technician to accurately identify the root cause of the issue.

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