Question about 1997 Pontiac Grand Am
What you need to do. is use the codes you get ,to look at a diagnostic chart,of possible causes for the codes.
If it is an O2 or any other sensor, you should perform some type of test,to determine,not only if their not working correctly,but what the system problem is ,that set the codes.
OBD2 Codes-do not tell you what to replace. They indicate a system malfunction. It is up to you to diagnose the issues.
If you believe you have a downstream O2 Sensor going,you most likely have a cat not far behind or it wouldn't be out of range and set the code
I would install a new cat and both sensors,on a 13 year old vehicle
Posted on Oct 01, 2010
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Posted on Jan 02, 2017
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