O2 Sensor - 1995 GRAND AM SE

Alright, I just spoke with my dad the other day and he mentioned some symptoms of a bad O2 sensor. Hesitation on accelerating, shaking, maybe some other things that I can't remember off the top of my head.

Anyway, can someone describe to me where to find the O2 sensor in this model and how to tell whether or not it needs to be replaced?

*OR*

Can someone point me to a site that describes where I can find it,maybe with a diagram or illustration?

Thanks in advance for any input!
matt

The first thing we need to know before we can help you it what size engine do you have? If you have a V6 it is probably located in the downpipe in the rear of the engine. There should also be one behind the cat. Some of the 4 cylinders have them on the exhaust manifold as well as one behind the cat. If yours is bad I would guess it is the one before the cat since that one only looks at cat effeciency.

If the sensor is bad you should have a CEL that will show you a code for the sensor. I think your issue is more of a fuel problem probably a dirty fuel filter and dirty injectors rather than a bad O2 sensor.