Scotty Kilmers' P0420 method

[jghall00]

I used the laquer thinner trick with success once on my 2008 Honda odyssey, but the code always returned after staying off long enough for me to pass emissions. Never had any success with Cataclean or any of the other OTS products. Soaking the cat in an acid bath worked, but even in that instance a P0430 returned within a few months.