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Hey, is this cat still ok?
Wood Gas Auto part Artifact Font
Automotive tire Wood Synthetic rubber Rim Carbon

That's part of the O2 sensor (now removed) in the top right corner.
I have to thank the techs at the garage who worked on my car for the pics I've been posting.
 

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It may be OK, only way to tell is putting in new sensors and see what turns up.
That's why sensor should be changed when plugs get changed.
 
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Hey, is this cat still ok?
View attachment 18183 View attachment 18184
That's part of the O2 sensor (now removed) in the top right corner.
I have to thank the techs at the garage who worked on my car for the pics I've been posting.
You should have uploaded higher resolution pictures, but I'd say you're burning oil. Your cat screen should look grayish, not black..
You should stick a light in the other end and see if you can see through the screen.
You can also try holding the cat upside down and burning off the carbon with a propane plumbing torch.
If you're burning oil, then this will likely happen again, and next time, sooner.
The other thing is to make sure the engine is running well otherwise, because if your computer isn't getting the correct information from all the sensors it uses, it will likely have the engine run too rich, and that's a big problem for your cat since the cooler exhaust temperatures won't burn off the deposits from the cat screen like a proper running engine with a leaner mixture and hotter exhaust.
 

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2011 Equinox 1LT V6 3.0L FWD 173k miles
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I鈥檓 reading and scrolling through this thread and up pops the funniest screen name I鈥檝e seen here (I think): @Equinox Plague

If you actually have the data, you should consider writing a Wikipedia page. We know when this Plague started, but it鈥檚 unclear at this time if it ended when GM said it ended.

And we really don鈥檛 know how many victims there were, either.
 

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I thought it was burning oil even before the CEL. The cat is on the car now so it's a big deal to check again especially it's now winter. The mechanic who did that job was wary the cat was in bad shape too.

The engine runs really well I hope a new o2 sensor will stop the P0420 for at least a couple of years...
 
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