Question about 1990 Geo Storm
The O2 sensor monitors the presence of oxygen or the lack of oxygen in the exhaust. It sends a signal back top the computer that tells it if the exhaust is rich or lean. The computer than calculates a fuel trim value to either lean the air fuel ratio or richen the air/fuel ratio.
In a nutshell it is one of the sensors that helps the computer decided how much fuel to give to the engine.
Posted on Oct 01, 2010
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Posted on Jan 02, 2017
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