Hey, is this cat still ok? View attachment 18183View 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.
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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