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OneFstGt
04-26-2009, 04:48 PM
I used to have an O2 Delete but i had the PCM Tuned by MPRacing to replace the O2 Sim. Do i need to plug the O2 sensor back in or leave it unplugged. Will it make a difference on the performance?

Mike Jung
04-26-2009, 04:51 PM
You must be talking about the rear O2 sensor behind the Cat.

It does not effect performance at all.
Just tells you if the stock Cat is working properly.

If you have the code tuned out: You do not need to plug the O2 Sim. in.

westerndragon
04-26-2009, 04:51 PM
if you no longer have the O2 delete, the pcm will look for it and throw up a SEL if it cant find it as for your performance i dont know

OneFstGt
04-26-2009, 04:57 PM
You must be talking about the rear O2 sensor behind the Cat.

It does not effect performance at all.
Just tells you if the stock Cat is working properly.

If you have the code tuned out: You do not need to plug the O2 Sim. in.

I sold the o2 sim, but do i need to plug the o2 back into the main harness or will it matter?

Mike Jung
04-26-2009, 05:01 PM
I sold the o2 sim, but do i need to plug the o2 back into the main harness or will it matter?
I would plug it back in.

Just so you seal the hole & the plug harness from getting dirty.

OneFstGt
04-26-2009, 05:24 PM
Ok cool, thanks for helping.