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Originally Posted by HumminNBoatin'
My dealer told me that all GM vehicles have a 80K warranty on Cats. They are required to have it. I am looking at my service records. Looks like the code i threw was P0420: Low Efficiency Bank1.
Tech notes: replaced left side cat. Convertor
This was done at 54K miles. total work billed to $570.
Customer Cost: $0
I do not have an extended warranty.
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Right you are, Thanks for your contribution, much appreciated, I just learned the same thing, just coming home from cerritos hummer, had to leave her there, they are going to put her through some tests to solve this, so far they think its the cat, not sure which one, but one of them.
Cheers
Hucky