Knock Sensor

Knock Sensors are designed to detect preignition, a phenomenon that occurs when the air/fuel mixture in the combustion chamber ignites before the spark plug fires. The engine control module uses the Knock Sensor’s data to adjust the ignition timing and injection pulse width. Without Knock Sensors, preignition could cause damage to the engine or engine components.

Wells Knock Sensors are engineered and tested to meet or exceed OE parts in fit, form and function.

The Knock Sensor is bolted to or threaded into the side of the engine block or under the intake manifold.

If the Knock Sensor is failing, a vehicle may display the following symptoms:

• Knocking or rattling sound
• Poor fuel economy
• Poor acceleration
• Increased emissions or failed emissions test
• Check engine light is illuminated