Pontiac Repair: 1997 Pontiac Grand Am, possabilities, pontiac grand am

Question
Why is my O2 sensor not reading?  Is it because of rich fuel and or faulty fuel pump?

Answer
Hi Jackie:

which O2 sensor is not working on this car? I assume you had it replaced and it's still not working???? I would sya that this had a bad ground wire on one of the engine to transmission mounting stugs either the wire is corroded or it's broken right off and this would be the first thing I would look at. The other possabilities are a wiring issue to the sensor it's self or lastly a bad engine contol module (ecm). Good luck and happy holidays.