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I got 5 codes for 5 bad sensors, this is what happened:
5 sensors, including oil switch, get 5V from PCM. Every sensor has its own wire, but 5 wires are connected together inside PCM. Oil switch connector broke, shorted 5v wire and all 5 sensors stopped working!!! I went to junk yard, removed 6-7 connectors and only 2 of them were good! I guess, this is common GM problem, bad oil switch connectors.
 

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You should be able to buy the connector shells and terminals from Mouser Electronics after you determine what they are... The part numbers are in the FSM.
 
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