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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Oxygen Sensor: Service Precautions

Do not use sealants containing silicone to seal the intake area on engines with oxygen sensors. Silicone particles are not consumed during combustion, consequently the unburned particles travel via the exhaust stream to the oxygen sensor where they can eventually coat the sensor probe and interrupt or destroy proper oxygen sensor function. Do not use electrical contact cleaner (or equivalent) in the area of the heated oxygen sensor harness connector because it can lead to corrosion damage of the oxygen sensor.