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

Oxygen Sensor: Service and Repair





When replacing the oxygen sensor, the exhaust manifold threads must be cleaned with an appropriate sized tap.

If reusing the original sensor, coat the sensor threads with an antiseize compound such as Loctite 771-64 or equivalent. New sensors have compound on the threads and do not require an additional coating.