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:






WARNING: Perform this on a engine that has cooled to prevent burns.

1. Disconnect 1-wire (RED/BLU) connector from Knock Sensor.
2. Remove Knock Sensor from cylinder head.
3. Install new knock sensor, torque to 32 Nm (23 ft lb).
4. Re-connect 1-wire connector to sensor.