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Re: 02 Sensor Heater Circuit Malfunction ????
That means that there is a problem with the heater circuit for the post-cat O2 sensor. Check at the connector with the car running, it should have battery voltage across two of the terminals... can't think of the colors. Anyway, if you have power and ground there for the heater circuit, then the O2 sensor is bad.
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'04 Cavalier coupe M/T 2.2 Ecotec
Supercharged 14 PSI boost, charge air cooler, 42# injectors
Tuned with HP Tuners
Poly engine/trans/control arm bushings
Self built and self programmed progressive methanol injection system
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