View Full Version : O2 Codes Cant Get Thim To Go Away

08-02-2007, 06:58 AM
I Have A 1998 Trans Am Ls1 That I Put Headers On An Took The Conv. Off And It Put The Service Engine Soon Light On So I Bought 02 Sims And Clear The Codes But The Light Came Back On 2 Days Later With The Same Code What Should I Try Next

08-02-2007, 09:13 AM
Need to know the specific codes you are getting. You could have some bad sims and throwing codes for the rear O2's not working properly (or at least not appearing to work properly). Or, you could be throwing CAT codes (if I understood correctly that you removed the CAT's).

In either case, the best bet is to identify the specific codes. Ensure that they are related to the changes you made. Then find someone with tuning software and have them turned off.

08-02-2007, 11:28 AM
Front codes can come from the headers themselves. The best
suggestion I've seen recently is to raise the closed loop enable
temperature to near your minimum ECT (thermostat) to hold
off trying the O2s until things are good and hot. Switching
codes are the first to fall, if you have an exhaust cooling kind
of problem.

But you do have to be more specific about which of the hundreds
or so codes, about 20 just for O2s, you mean.