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

Upstream

1. Disconnect the battery ground cable.
2. Disconnect the electrical connectors from the upstream Heated Oxygen Sensors (HO2S).
3. Use Oxygen Sensor Wrench T94P-9472-A or equivalent to remove sensor(s) from exhaust manifold(s).
4. Reverse procedure to install. Tighten sensors to 30-49 Nm (22-36 lb ft).