O2 codes won't go away!!!
O2 codes won't go away!!! Okay, in short I have spent almost $500 over the last 3 months trying to get rid of my ses light. Originally, I was showing codes P420, P1133, and P1153. I bought simulators for the rear, then ended up getting the rear codes deleted by someone using LS1 edit. A couple weeks ago I replaced both front oxygen sensors with Bosch 13111's and cleared codes P1133 and P1153. I also took out and sold my simulators because I thought I would not need them any longer. Today the SES light came on AGAIN with codes P420, P1133 and P1153. If LS1 deleted the codes for the rear O2s, why is P420 showing up again? And what could possibly be wrong with my front O2's? I didn't replace my plug wires when I installed my LT's, could that have anything to do with it? Also, my mileage actually decreased when I put the new front O2's in, and now it's at a dismal 12 mpg. I also notice some hesitation under moderate (but not WO) throttle. What's going on here? My AFR is 14.1:1 btw.
Yeah, that's what I thought...I asked the tuner to delete codes for the front O2's as well, but apparently the front's cannot be deleted, as this would keep the ecm from pulling data from the front's....correct?
Sometimes P1133 and P1153 have to be set to no error reporting with headers. I've found SLP headers seem to be the worst for those codes. Note that is not turning off the front O2s for fueling, just the error reporting for when they switch slow. As for the P0420, your tuner must have not turned it off. If he missed it, make sure he didn't miss P0430 also.
Hmm....that's not what my tuner told me. When I called him on the phone stating that the codes that he supposedly deleted had come back on, he said that the codes could not be turned off, or else the car would not idle. I'm beginning to think I wasted my money...
