That is telling you the Engine Computer detected a problem and set a diagnostic fault code. The place to start is by reading and recording that code. Those codes never say to replace parts or that one is bad. They only indicate the circuit or system that needs further diagnosis, or the unacceptable operating condition. When a sensor or other part is referenced in a fault code, it is actually the cause of that code about half of the time. First we have to rule out wiring and connector terminal problems, and mechanical problems associated with that part.
The people at many auto parts stores will read those fault codes for you for free, but their equipment often doesn't work on '95 and older models. You can also read the codes yourself by following the instructions on this guide:
https://www.2carpros.com/articles/buick-cadillac-chevy-gmc-oldsmobile-pontiac-gm-1983-1995-obd1-code-definitions-and-retrieval-method
The definitions are listed, or I can interpret the fault code for you.
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Tuesday, January 29th, 2019 AT 4:51 PM
