how to check to make sure cat. converter is bad
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2000 Toyota Corolla Question: code po420
Answer #1dandd June 21, 2009, 17:42Master
Typically you will have a Check Engine Code P0420 or it will rattle, especially in the morning. The code P0420 is common for the 1.8 lire Corollas. see the link below.
Answer #2Visitor, November 10, 2010, 15:36
check back pressure with gauge
Visitor, December 05, 2010, 14:08
how can i check to see that the cat converter is not bad?
Answer #4Visitor, August 01, 2011, 13:08
I have problem on codep0420
Replywywwwnet, March 17, 2014, 17:34Rookie
check for p0420 TSB! get toyota to reprogram it. they'll charge ~$100 but cheaper than replacing the Cat.