Description
Signs of a Bad Knock Sensor
When the knock sensor fails, it will usually cause one or more noticeable symptoms. The most common knock sensor problems include:
Illuminated Check Engine Light
The most common sign of a bad knock sensor is an illuminated check engine light. When the PCM detects a problem with the knock sensor or its circuit, the module will turn on the check engine light and store a corresponding diagnostic trouble code (DTC) in its memory.
Pinging Noise From the Engine
If the knock sensor fails, the PCM may not recognize or correct spark knock. As a result, you may hear a metallic pinging noise from the engine. The noise is often most noticeable when the engine is under a heavy load.
Poor Engine Performance
A faulty knock sensor can also cause the PCM to misadjust the ignition timing, resulting in poor engine performance. If you’re wondering, “Will a knock sensor cause a no-start?” it’s rare for this to happen, although a bad knock sensor can make starting your vehicle more difficult.
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