MIL and Cats Codes
Thread Starter
Racer
Joined: Oct 2021
Posts: 258
Likes: 26
From: NY
MIL and Cats Codes
My 2007 with only 5300 miles was running fine, fast, no misses, very happy, but then the serpentine belt shredded and I got several warnings: Check active management; tire pressure; the engine symbol came on. When I read the codes it showed the cats are the problem, both of them. The car had been sitting for several years and I just bought it, probably why the belt quit. I was driving it like I stole it, so maybe the hard driving was too much. Is there any chance the cats are good or can be made good, with only a few thousand miles on them it just doesn't seem like they should need to be replaced.
Thanks in advance.
PS, the car has a Magnuson charger, headers and SLP mufflers. and still runs amazingly quick.
Thanks in advance.
PS, the car has a Magnuson charger, headers and SLP mufflers. and still runs amazingly quick.
Moderator, Tech Contributor
Joined: Sep 2013
Posts: 15,610
Likes: 4,061
From: Cape Coral, Florida
Like I have mentioned here recently “bad” cats are an “EFFECT” and not the cause of your DTC’s especially with a car with 5300 miles….cats should last as long as the car and trouble codes are NOT parts…since the car had been sitting awhile I would maybe suspect issues with your injectors being clogged…are P0420 and 0430 set ??…an exhaust leak anywhere between the front and rear O2 sensors can cause these DTC’s…also oil or raw fuel contamination and coolant can destroy the cats…find what is causing those DTC’s before replacing the cats and if you do need to change them OEM is what you want to buy and not aftermarket !!…where in NY are you located ??
Last edited by C5 Diag; Oct 25, 2023 at 10:31 AM.
Moderator, Tech Contributor
Joined: Sep 2013
Posts: 15,610
Likes: 4,061
From: Cape Coral, Florida
Moderator, Tech Contributor
Joined: Sep 2013
Posts: 15,610
Likes: 4,061
From: Cape Coral, Florida
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Moderator, Tech Contributor
Joined: Sep 2013
Posts: 15,610
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From: Cape Coral, Florida
Let us know if your local shop can tell you WHAT is causing your codes and not just that you need new cats…that is likely what they’ll tell you.
Thread Starter
Racer
Joined: Oct 2021
Posts: 258
Likes: 26
From: NY
Thanks, I understand, I won't accept any repairs. just diagnostic. I'll let you know what he says. The apt is tomorrow.....
I've wanted to check him out for a while now. It would be great if he's in line with your (and mine) thinking. It's a 30 minute drive.
I've wanted to check him out for a while now. It would be great if he's in line with your (and mine) thinking. It's a 30 minute drive.
Moderator, Tech Contributor
Joined: Sep 2013
Posts: 15,610
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From: Cape Coral, Florida
@C5 Diag I'm curious why only use OEM cats and not aftermarket?
Because the OE converters contain the proper amount of precious metals in them that make the cat work correctly…that is why they are more expensive…if one lives in California or NY the cats must be CARB compliant or they will fail inspection.
Drifting
Joined: Aug 2022
Posts: 1,507
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From: Ruskin, FL
Thread Starter
Racer
Joined: Oct 2021
Posts: 258
Likes: 26
From: NY
South Main Auto in Avoca...run by Eric O and he has a pretty popular YouTube channel...one of his videos on your CAT codes.
https://youtu.be/CflIvd5VOoA?si=fNTw8f4GcjYFC7zv
https://youtu.be/CflIvd5VOoA?si=fNTw8f4GcjYFC7zv
"Working on a modified car in NY with aftermarket cats is illegal for any shop owner. In NY we have very stick cat/exhaust laws (As of Jan. 1, 2023) that we must follow. With an aftermarket supercharger, software and exhaust system I am not willing to risk my business to make a few dollars. Sorry. Perhaps look for a shop that can perform work on vehicles with custom tunes."
I've found a mechanic who specializes on Vettes closer to home in Syracuse. I'll let you know how he works out.
Moderator, Tech Contributor
Joined: Sep 2013
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From: Cape Coral, Florida
Well, Eric was no help!! Here's his reply:
"Working on a modified car in NY with aftermarket cats is illegal for any shop owner. In NY we have very stick cat/exhaust laws (As of Jan. 1, 2023) that we must follow. With an aftermarket supercharger, software and exhaust system I am not willing to risk my business to make a few dollars. Sorry. Perhaps look for a shop that can perform work on vehicles with custom tunes."
I've found a mechanic who specializes on Vettes closer to home in Syracuse. I'll let you know how he works out.
"Working on a modified car in NY with aftermarket cats is illegal for any shop owner. In NY we have very stick cat/exhaust laws (As of Jan. 1, 2023) that we must follow. With an aftermarket supercharger, software and exhaust system I am not willing to risk my business to make a few dollars. Sorry. Perhaps look for a shop that can perform work on vehicles with custom tunes."
I've found a mechanic who specializes on Vettes closer to home in Syracuse. I'll let you know how he works out.
He’s definitely not going to risk his business and reputation on your car…too bad !!
Thread Starter
Racer
Joined: Oct 2021
Posts: 258
Likes: 26
From: NY
https://govt.westlaw.com/nycrr/Docum...8sc.Default%29
I prohibits installing or selling aftermarket Cats in NY, it doesn't say anything about working on Cats that have been installed in a car, or working on a car that has aftermarket cats already installed.
I think Eric should get a copy of this law.