i have a y pipe and for over a year now i ignore the 02 sensor code. i believe it is p0138, p0139, and p0140 code. i've just been procrastinating the 02 simlulator but the other day, the SES light shut off (roughly about a full day driving). now it's back on. it's been doing this but 99% of the time SES is on, just at times it doesn't light up. any suggestions?

 

fault healing...

if it proves out when you KOEO, its working. if you start, and it happens to be out, the fault is healing itself. it just means the fault is intermittent...

 

oh i see, so it's nothing i should worry about? esp when i do'nt have an o2 simulator...

 

IIRC those are the faults that require ECM reprogramming and possible HO2S replacement, per TSB...

nothing thats gonna burn the car down, i guess...

 

it's H02S B1, which is the y pipe o2 sensor... when eliminating the precat.. it will cause SES light to stay on and what people do is get o2 simulator. only thing i'm worried is that it shuts off randomly. i guess i'll try to o2 simulator to resolve this.