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

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Oxygen Sensor: Description and Operation

Fig.19 - Oxygen Sensor Sectional View:






The oxygen sensor monitors the composition of the exhaust gases leaving the engine.

Signals from the oxygen sensor are transmitted into a closed loop feedback system which continuously adjusts the air/fuel ratio to reduce emission of hydrocarbon (HC), carbon monoxide (CO) and nitrous gases (NOx).

The oxygen sensor must be replaced every 30,000 miles.