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

Heated Oxygen Sensor (HO2S) Locations









The two upstream heated oxygen sensors (HO2S) are mounted in each of the exhaust manifolds.











The two downstream heated oxygen sensors (HO2S) are mounted in both of the exhaust inlet pipes, just below the exhaust manifolds.