Need some info on rear O2's

[Fbomb]

So I finally crawled under my car today to check out my job for next week and found out that I've got rear O2 sensors! I can't believe I didn't see them before

I'm starting this Sunday and my Y doesn't have provisions for rear O2's but I could make them, but they would still throw codes because I won't have cats. To my knowledge they're not used for anything but testing the catalytic converters right? So if I just unplug them until I get some sims it'll just throw codes and not hurt anything right?

I can't believe I didn't see them. WOW

[my95z28]

Correct, downstream do nothing but make sure the cats are functioning correctly.

[Fbomb]

Ok cool, I guess I'll just zip-tie them out of the way since my check engine light already comes on from a vacuum canister/evap emissions leak anyway. I do scan it every so often though just to make sure nothing else occurs.

Hope this job goes well!

[SSTODD]

You can also tune them out and just plug the bungs if any. Since sims fail quite often, most just get a tune after headers and cat removal.

[Fbomb]

Yep I'll end up doing that but I just don't have time/money for a tune right now. At least it'll run fine without them.

[DETROITMUSCLE]

Your car will be just fine, the ses light will be on but its no big deal. Start saving for a tune and you'll be very happy afterwards.

[Fbomb]

Currently saving for a head/cam swap and intake/TB...basically gonna build this motor and hope the bottom end holds. Planning on some AFR mongoose heads so it's going to be a while whilst only making $50/week at school unless I sell my dirtbike in spring. Might also have connections to get a free FAST manifold that isn't on the market yet. Wonder what kind of gas mileage I'd get with a .560 lift on the intake...