theblur98ss

iTrader: (71)

I have a low rpm misfire. Usually only does it below 2000 rpm. Most of the misfires are on the driver's side cyclinders with #1 and #5 being the most frequent. I just did headers a couple weeks ago and had the O2's out. I don't think it's a plug or wire problem. Here are the atap codes:
po134 H02S circuit activity bank 1 sensor
po135 HO2S Heater circuit bank 1 sensor
po140 HO2S Circuit activity bank 2 sensor
p1133 HO2S insuffient switching bank 1 sensor 1
I have no 02 simms for the back 02's but what does this say bout my front ones?

dfarmercse

All your problem are contained to the left bank. O2 snesors and misfires. All O2 deal with the precat sensor except one. If you do not have a postcat sensor you will get the no activity from that one. Are you sure your precat left bank sensor is pluged in? It shows no activity, no heater circut and switching. Hard to believe it has completely failed. Check to make sure it is pluged in. reset the codes and then start your car cold,hand brake on, in park for auto or neutral for M6 and let run for atleast two minutes. See if your ses light comes back and what the codes are. This idle runs dio on your O2's and other things.

WILWAXU

iTrader: (6)

well.. sounds like one bad O2 to start with.

Going to move this to Tuning Section.