Thread: Disabling Cat Diagnostics

Spark plug non foulers work

Originally Posted by Bedwards

I wanted to replace that O2 sensor with a wideband. Won't be possible?

I did that with mine and I have not had any issues. If you have hp tuners just uncheck ses enable on the po420 dtc. See if you start getting 16.4 lfts when you are at a cruise or idling. if you do chances are you will need to rerun the rear 02

Originally Posted by Bedwards

Your fuel trims were fine when you did that?

Yep. its been about two months with no issues

Replaced the rear O2 with my wideband in my 01 Grand Prix GT. Fuel trims were unchanged. The cat diagnostic must only react on 01+ GTP's (not GT's, as both me and 01gpgt01 have GT's with no problems).

Mine is one of the freaks that runs fine with out it.

you have a wideband in your rear o2 sensor bung after the cat?

Originally Posted by Bio248

you have a wideband in your rear o2 sensor bung after the cat?

I am assuming he did not install a cat with his speed daddys and is just using the extra bung in the rear.

Bedwards I was a victim of the 16.4 issue. If you can load a bin file into hptuners...let me know I got a fix. Mines a 2002 btw.

I have the same problem, what did you do to fix it?
Thanks

You can disable it in Tiny Tuner. I'm not on here or don't have much time to post here anymore, but it is possible in Tiny Tuner. Look in diagnostics> cat diagnostics and set the cat diagnostics to 0.