Probs with hi-flow cats?
Thread Starter
Instructor
Joined: Jun 2004
Posts: 105
Likes: 0
From: virginia beach va
Probs with hi-flow cats?
I just sold my '04 that's equipped with Bassini headers and hi-flow cats. On the way home with the new owner the engine light came on and showed code P0430 (cats). It was reset from the DIC, went off a few days, and then came back on. The headers/cats have been on about 2 years, the car has 15K miles and has never thrown a code like this. The car set around for about 6-8 weeks waiting to be sold, I started it and drove around the block occasionally, but no highway use. The guy took it to a Chevy dealer who said both cats were bad and sensors were good based on ohm readings. Needless to say, cats are not covered under warranty.
My theory is the cats need some driving time to get hot and "cleaned out" after sitting around. Anyone have an experience like this or know of any specific testing to do?
Thanks in advance for your help!!!
My theory is the cats need some driving time to get hot and "cleaned out" after sitting around. Anyone have an experience like this or know of any specific testing to do?
Thanks in advance for your help!!!
Racer
Joined: Aug 2006
Posts: 404
Likes: 0
From: Napa Ca
best thing to do is go to a tuner and get the rear 02 sensor deleted and you shouldnt have a problem. I doubt its bad cats ...but i could be wrong. My car threw the same codes and its from the long tube header install. For some reason the rear 02's jsut dont like hi-flow cats.
Burning Brakes
Joined: Jan 2006
Posts: 1,170
Likes: 27
From: Magnolia Greens NC
Two Solutions...
Originally Posted by blackc598
best thing to do is go to a tuner and get the rear 02 sensor deleted and you shouldnt have a problem. I doubt its bad cats ...but i could be wrong. My car threw the same codes and its from the long tube header install. For some reason the rear 02's jsut dont like hi-flow cats.
Thread Starter
Instructor
Joined: Jun 2004
Posts: 105
Likes: 0
From: virginia beach va
Thanks guys, I've heard of tuning out the rear sensors. The thing that still puzzles me is the car was great for 2 years, about 10,000 miles with no problems, just fun........then the day I sell it the code starts coming up 
It's the new owners 1st Vette and he dosen't know much about them.
Anyone think that just driving it some more would help?
It's the new owners 1st Vette and he dosen't know much about them.Anyone think that just driving it some more would help?
Le Mans Master
Joined: Jun 2004
Posts: 6,269
Likes: 50
From: Dallas Texas
St. Jude Donor '06-'07-'09-'10
Once the CE light starts coming on, the only fix is as stated above, either install sims or turn off the rear sensors. 
When I started getting CE lights after about 3K miles, I had mine turned off and the fan temps lowered for $50 bucks.
When I started getting CE lights after about 3K miles, I had mine turned off and the fan temps lowered for $50 bucks.
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Burning Brakes
Joined: Jan 2006
Posts: 1,170
Likes: 27
From: Magnolia Greens NC
Code 0161
Originally Posted by SleeperC5
Supposivly I had my rear O2s turned off, BUT now and again I still get a CEL and code 0161 (O2 #2 Bank #2). Whats with that?
Melting Slicks
Joined: Jul 2004
Posts: 2,826
Likes: 39
From: Central NJ
St. Jude Donor '05-'06-'08-'10
Good ol' O2 sensors. This is the most frustrating part of modding a C5. Once you start changing headers/cats/engine mods/ etc, you're in for some type of Check engine lamp issues. I've been fighting to get mine straight for months. Good luck, but the rear o2 codes should be easy enough to delete without any other issues. 