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P0420 in 2002 Toyota Corolla - needing some advice on what to replace next


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Bdoom2
User

Oct 29, 2019, 2:25 PM

Post #1 of 3 (773 views)
post icon P0420 in 2002 Toyota Corolla - needing some advice on what to replace next Sign In

Hey! I’m Bdoom2, I’m new here and this is my first post.

I have a 2002 Toyota Corolla LE. I’ve had it for about a month and a half now. When I got it, it had a misfire code for Cylinder 2. I replaced the spark plugs, ignition coils and fuel injectors, which solved that issue. Come to about a week ago I got a P0420 code saying that my catalyst converter is below threshold bank 1. Engine runs healthy, doesn’t sound clogged, and there’s the normal amount of smoke coming out of the exhaust pipe as there would normally be in any car in 35*F weather. Ive done my research and found that bad fuel injectors would USUALLY cause a misfire on top of that, plus I replaced them <500 miles ago so I think they’re ruled out.

What should I do next?


I’ll also link a YouTube video once it is uploaded to show you the freezeframe.

EDIT: Link:https://youtu.be/me9w4jb9bkw


(This post was edited by Bdoom2 on Oct 29, 2019, 2:42 PM)


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Oct 29, 2019, 3:36 PM

Post #2 of 3 (750 views)
Re: P0420 in 2002 Toyota Corolla - needing some advice on what to replace next Sign In

A P0420 is pretty clear. The Converter is chemically not doing what it's supposed to.

95% of the time it is a bad Converter. The fact that it was driven with a misfire for a period would clearly explain the cause of the bad Converter.



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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



Tom Greenleaf
Ultimate Carjunky / Moderator
Tom Greenleaf profile image

Oct 30, 2019, 12:32 AM

Post #3 of 3 (730 views)
Re: P0420 in 2002 Toyota Corolla - needing some advice on what to replace next Sign In

Side note: That cold air temp fog out a tail-pipe isn't quite cold enough yet @ 35* as you put it to last long upon start up so it IS smoke probably not normal moisture fog. That would probably wipe out a converter so find out what that is,


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