Codes Showing Both Cat Converters Faulty, Remove them?

[Tommyjoel05]

Hey guys,

So I'm about 6 months into my ownership of a 2005 A6, 3.2. Just yesterday I got the check engine light, and so took it to an Audi/VW specialty shop instead of the dealer for a scan. It showed only the two codes: P0420, P0430. Tech explained this means both cats are faulty. He quoted me on having them replaced with OEM cats, which was well over what I expected. He cleared the codes using the VAG Com and a program on a laptop. The light is off, and I've driven it about 40 miles since and still no light. So here's my question: I live in a county here in NM that does not require emissions testing for registration renewal. What if I had the cats removed altogether? Would this trigger any problems? Would I need to buy special O2 sensors to keep the ECU from triggering a check engine light? Please share any thoughts or recommendations on my issue here.

Thanks in advance.

[SinCityA6]

Instead of running no cats and having to deal with the check engine light from not having any, why not run a set of "High Flow" cats instead? Should be able to find them much less costly then OEM and, since you dont have emissions testing, there would be no registration issues.

[Tommyjoel05]

Instead of running no cats and having to deal with the check engine light from not having any, why not run a set of "High Flow" cats instead? Should be able to find them much less costly then OEM and, since you dont have emissions testing, there would be no registration issues.

I like the idea. Thanks. I've read that some people with high flow cats still throw the check engine light. Have you heard this too? Any thoughts on that?

[Euro_head]

I'm not sure of this would work on the C6 but on my old S4 I removed the cats and used a o2 sensor spacer for the rear o2 sensors and drove it 2 years with no codes


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[D's Avant]

HFC's with spacers and you should be fine. One of the best mods I did on my old B5 Avant.