speedy0009

My SES light came on over the weekend, so I went to AutoZone to have them check what was going on. Well, I the car pulled a P1153 code, in which the guys at this particular AutoZone didn't know which code went to what on the computer screen. I wrote down the two possibilities hoping someone here could help me out.

Lack of HO2S21 Switch Rich
or
Bank 2 Fuel Control Shifted Lean

Which description is it and should I do anything about it? It has something to do with th O2 sensor I am sure of that but how bad if at all? Thanks in advance!

stik6shift98

those two things sound completely different...either your car is rich or its lean.....


unless its lean at certain rpms and then runs rich.....prob need new o2s

what mods do u have???

My84Z

o2's man there goes 80 bucks we can try to clean them with some cleaner then try again.

speedy0009

mods are in my sig

sleeperZ96BT

not sure whether you mean $80 for 1 or two John, but Todd, if you pay much more than $60-70 for BOTH you are getting reamed. i think i got mine through jason cromer, could have been dal though. and stick with the stock GM ones if thats the case (needing new 02's). did you mess with any wiring when you installed the guages?? that may trip it....
brian

My84Z

I meant 2 i believe they are 40 a piece i say we try some cleaner first though they could just have a **** load of carbon considering how ls1 are notorious for running rich when you get on it.

speedy0009

Brian the only wires I tapped into were the purple ones, but that was a long while ago now, so I doubt thats the problem. I could definitely try cleaning them, but I am not very worried about it right now, because the SES light is out and the car is running jsut fine. Thanks for everyones input.

oh yeah! when I was at AutoZone the prices ranged from like $60ish to $79ish. that was aftermarket stuff too. but like i said for now i am gonna forget about it.

Camaro ChriSS

The O2 sensor, in normal operation, is supposed to switch been rich and lean conditions many times during a time period. The PCM monitors this switching every 100 seconds. A P1153 is set when the O2 sensor does not switch enough times.

Usually this code is triggered by an exhaust leak or a bad O2 sensor. And the O2 sensor goes bad either from age, fuel contamination, oil/coolant consumption, or some RTV sealant getting on them.

It could just be temporary. Watch for it. The code will clear after 40 ignition cycles if it is only temporary.

speedy0009

Thanks Camaro ChriSS for the input. That makes this more understandable, I think for most of us.