[reddvette]

Simple question. I'm sure it has been asked many times on here before. I'm like most people. I have a 2000 C5 6sp manual coupe and I have done an intake, long tube headers (w/cats) and a Corsa X-Treme axle back muffler system. Now I get the pesky check engine light (P0420) from the rear O2 sensors. Most of the tuners around here (Toledo OH) do only imports (sadly) and don't know the GM product.

[Roman1]

Sounds like a result of the high flow cats, I had the same issue when I installed my LT headers and high flow cats, the only way I know of to resolve it is to have a tuner turn off that check in the PCM. That worked for me. otherwise its not an issue that will impact any performance.

[Hotrod]

If you do a Google search for "tuning" , you should find lots of books, onsite courses and online courses designed for the beginner. Good luck!

[reddvette]

Thanks guys for posting a response. This thread sat dead for awhile. When I logged on today, Smokinvette had a very informative article on the left side of the page that dealt with the topic of tuning and how to learn more about it. They sited three websites: www.thetuningschool.com www.calibratedsuccess.com
www.masterenginetuner.com

They also posted an E-Mail resource:
Tunerlocator@cfl.rr.com You can E-Mail them with your make/model and list of mods and they will refer you to a tuner in your area. haven't actually pursued this just yet due to other time constraints but I will be doing so soon. Thanks again!

[Blowtorch]

I purchased the HPTuners pro, but it wasn't much more than a paper weight until I took the tuning school, (where I got to dyno tune my own car and picked up over 100hp over a tuners work)
Now I have a decent understanding of the process, and can tune all of my cars, although Im a LONG way from being an expert