LS1 Sounds

iTrader: (11)

I decided to remove the rear O2 sims while changing the oil on Saturday and my car still hasn't tripped any codes. I have driving it every day since then, and verified that the codes aren't disabled in my HPT .bin. The rear O2 plugs are just zip-tied out of the way and the connectors are empty.

Any reason this would be happening? Other than the fact that my car needs an exorcism?

horist

Since the rear codes are still enabled... they'll probably set over time... I'm not sure what the driving cycles required are though

Are yoiu doing a SD tune right now and or open loop tune now? if so that's prolly it... wouldn't make sense for the PCM to set CAT codes if it's in Open loop... SD i'm not sure though...

How about your other readiness tests... they completed? (if the PCM doesn't look for a bad cat in SD and /or Open Loop... i'd imagine it won't pass any other tests either cause it's not even lookin?)

txhorns281

iTrader: (12)

I never threw AIR, EGR, or rear O2 codes... Can we say modded before? My codes were off... lol

LS1 Sounds

iTrader: (11)

I'm currently doing closed-loop SD tuning with the stock O2 sensors. That's an interesting point about them not being checked in SD mode, I'll have to check that theory out and report back. The only code I've set so far is P0103 for the MAF sensor fail.

I'll report back later with the findings. It probably won't be until after this weekend though, my tune looks pretty good right now and I don't want to screw anything up before I go to the track on Saturday.

Thanks for the tip!

LS1 Sounds

iTrader: (11)

That's the very first thing that came to my mind too... I was kind of relieved to see that the codes were still enabled.

SLPSS01

iTrader: (6)

I think it's normal and all cars are going to be different.
I just put headers in a few weeks ago and it took about 45+ miles before my ses light came on. I know someone who drove for several weeks (200 miles +) before it tripped the code.

SupahRich

iTrader: (14)

I removed my EGR, AIR and Cats when I did my LT/ORY install a few months back. Not running O2 sims... Had the car scanned with HPTuners a couple weeks ago and the only code that was being thrown was for EGR

LS1 Sounds

iTrader: (11)

I forgot all about this thread... I did end up enabling my MAF again and the code appeared very soon afterwards. The SD tuning did prevent the missing rear O2's from setting a code on my car.