Clean Catalytic Converter?

bronson1111 · Post by **bronson1111** » 07 Jun 2011, 10:38

2002 Volvo S80 T6

CEL is on and I have a code PO422 and PO420
-Catalytic Converter problems

I want to see if I can possibly clean it out somehow?

Also, is it difficult to remove the cat converter and clean it that way? Maybe throw the whole thing into a bucket and let it soak and get cleaned?

I just want to get rid of this CEL! Hopefully i don't have to buy a new CAT Converter!!!

Thanks for reading!

Post by **boosted5cyl** » 07 Jun 2011, 11:15

You can attempt to clean it with some hard driving. Problem is that if its blocked enough you might end up with a fire on your hands by doing so. You cant pull them off without planning to weld them back on.

Not sure how effective solvents would be. At that stage if you have them off, just replace them with pipes.

Post by **brandonbeach14** » 07 Jun 2011, 17:44

P0422 Can be an O2 Sensor too, but if they have been replaced the cat could be clogged. When you tap on it do get a clank or thud? Clank would be good and thud is a sign of corrosion. I soaked a cat that had burnt oil in seafoam but it wasn't a Volvo. It did work and cleared the bad cat cel.