Went to autozone for lunch and picked up some synthetic oil, some oil additive stuff, and a 180 t-stat with a new seal for it also. I asked the lady working there about 02 sensors and she said they had some, but they were all Bosch and they wanted 70 for the front and 90 for the back. I decided to skip that part because of the bosch and mainly because of the price! What local store would you guys recomend for finding 02 sensors, i am just looking for the regular ac delco kind. And i want them by today or tommarow, but if i have to order it from a website i will. Napa you think?

Don't replace the back. That'* strictly for emissions. Only the one in the rear manifold affects performance and mileage. www.gmpartsdirect.com for the sensor, part numbers in Techinfo.

I have a Bosch, hmm.... could that cause a problem in my car? or just the Bosch spark plugs?

wow, thanks for that info! So only do the front one then!? Could I even reach the one in the back?

Of all places I got my replacement Oxygen sensor off ebay. Brand new in the box and only paid $17 for it! Works like a charm.

Bosch O2 sensors are proven crap in our cars. Worse than the spark plugs. I've been through it myself, and learned my lesson in less than 60 days. I went OEM (AC Delco) and never had another problem.

The rear O2 (after the cat) is easy to get to with the car up on ramps.

I went to Napa, O Reileys, Auto Zone and a local store and all of them only had Bosch. When I asked the dudes if they had anything else besides Bosch they said no, that bosch took it over and is the main product to use now. Anyways, looks like i will be buying it off the net. I might get a NGK sensor, any bad or good comments on those ones?

On a side note, I got everything in the mail today to do a tuneup, but the stupid air filter never showed up. Called the place, they want me to send them a fax of the invoice. Uggh, more waiting to do, which really ticks me off.

great info! I'm needing to replace my o2, too. saved me some trouble!