Do I need one or two o2 sims for my 96 TransAm?

 

Two.

 

Your car runs 4 O2 sensors. The 2 front sensors (one for each exhaust manifold) provide feedback to the PCM regarding air/fuel ratio. The 2 rear sensors (one after each cat) monitor the "health" of the cats. The O2 sims replace the rear O2 sensors to fool the PCM into believing the cats are good.

 

oh,i know what they are..i was just wondering how many. someone told me one

 

Can buying O2sims be avoided by simply tuning it out of the pcm?

 

Yes.

 

thank you.