Combustion Control: What does a Knock Sensor do?

The knock sensor creates a voltage signal based on the vibrations caused by engine detonation. The computer uses this signal to retard timing when spark knock occurs.

Where are these sensors located?

The knock sensor is typically located in the lower engine block, cylinder head or intake manifold.

Will a malfunctioning knock sensor illuminate the check engine light or affect vehicle operation?

Yes, a failing sensor can illuminate the malfunction indicator lamp (MIL), and may cause pinging and drivability problems.

What are the common causes of failure?

 Detonation (Knock) Sensorrelays, sensors and switches available on NAPA Online or trust one of our 17,000 NAPA AutoCare locations for routine maintenance and repairs. For more information on your engine knock sensors, chat with a knowledgeable expert at your local NAPA AUTO PARTS store.

Photo courtesy of Wikimedia Commons.

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