Chevrolet Repair Questions? Ask a Mechanic for Answers ASAP
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That would be the sensor itself. However, you will want to check that the wires and connectors are all good. There is always a chance that the PCM has an internal problem but whenever I have run into this, it was the sensor. Here is some of the tests for it along with a wiring diagram. The tests came out in reverse on the paste. You would start at one, (of course)