Quote Originally Posted by jjmitch87 View Post
I have read through all 9 pages of this damn thread 3 times now. i am not sure of the answer to my question STILL. i bought an 01 GTP, the cat has been removed, i have a P0420 code, thats it.
You and me both. I read the whole thread...twice, and still keep reading both conflicts in what to do, and conflicts between a few responders, which did nothing but confuse me further...lol

I have HPTuners, well used and understood on my other V8 LS based vehicles.
No intention of buying any other program or software, whatsoever...
Never tuned a positive displacement supercharger before...but have tuned centrifugal supercharged cars of the non-GM brand...

I have bought the HPTuners tuning license for my son's "new" 2001 GTP.

He also has the recurring P0420 code, I believe due to the converter being gutted out, and car is due for emissions inspection.

If I am understanding correctly, if I change the rear converter/rear O2 sensor codes to NO ERROR REPORTED, and UNCHECK SES (or MIL) light, then the PCM will try the cat test once, then fail, but not keep trying the "test"???

Without any Tiny Tuners or whatever else, is this my best option for not dumping fuel and/or failing the emissions test?

Thanks in advance.