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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Primary HO2S

Primary HO2S Replacement

Special Tools Required
Commercially available O2 sensor wrench, Snap-on YA8875 or SP Tools 93750 or equivalent




1. Disconnect the primary HO2S 4P connector (A), then remove the primary HO2S (B).
2. Install the primary HO2S in reverse order of removal.