Operation CHARM: Car repair manuals for everyone.
Manuals through 2025 now available!

Our trusted friends have launched a new website named LEMON, which has newer manuals. It also contains all the CHARM manuals.

LEMON is the spiritual successor to CHARM, I recommend you try it!

Link: lemon-manuals.la or lemon-manuals.org.ua

(Some people have issue connecting. LEMON is investigating. For now, use Firefox or change your DNS server)

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Knock Sensor: Service and Repair

Knock Sensor Location:





1. Disconnect the knock sensor electrical connector.
2. Remove the retaining bolt from the knock sensor.
3. Remove the knock sensor.
4. Reinstall the knock sensor and torque to 15 ft. lb. (20 Nm).