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)

Or, hide this message: temporarily or permanently

Knock Sensor: Service and Repair

Remove or Disconnect:
1. Negative battery cable.
2. Raise vehicle.
3. Knock sensor wire connector.
4. Knock sensor from block.

Install or Connect:
1. Knock sensor to block.
^ Tighten to 19 N-m (14 lb.ft.).
2. Knock sensor wire connector.
3. Lower vehicle.
4. Negative battery cable.