Question about 2005 Pontiac G6
Code 42 is a problem with the heater circuit for the O2 sensor number 3. That is usually the sensor after the catalytic converter.
The heater is not working which could be a faulty sensor or a problem with the power circuit going to the sensor.
Posted on Mar 27, 2015
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Posted on Jan 02, 2017
each window has a circuit breaker most of the time that i find them not working is the wire breaks inside the rubber boot between the door and the body
Posted on Jul 07, 2012
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