96 Toyota Tercel.Got a PO420 code then it would go away and come on,later I got a Cylinder 1 misfire code,I changed my plugs and a bad wire and it seemed to resolve the cylinder 1 misfire code.No problem with how the how car runs at all lately,now I am getting the P0420 code...
Yeah, if you replace the cat with an inadequate one, the code will be back as soon as the car tests the new one's adequacy. Interesting, so the only ones up to snuff are Toyota provided ? #8 Pioneerscot, Dec 20, 2023 ChapmanF Senior Member Joined: Mar 30, 2008 25,193 16...
I find that an OE gasket from Toyota works the best- for any brand cat. mr_guy_mann said: ↑ Here is my P0420 checklist. Is the engine running properly? - No misfires, even compression, no excessive oil consumption. Are there NO exhaust leaks from the cylinder head down to 18" ...