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04 SLE P0420 code day after passes inspection
Posted: Fri May 29, 2020 9:14 pm
by Jdub34
Hey everyone. Like the title says I got that code immediately after passing emissions and inspection. What are the odds of that? Exhaust has been louder than usual lately though but no obvious performance loss. Is it possible the shop bumped something loose that I could check or is it just coincidental timing and my cat is bad.
Re: 04 SLE P0420 code day after passes inspection
Posted: Tue Jun 02, 2020 10:23 am
by luke_dubs
EVAP system could actually have a problem, or the oxygen sensors on either side of the cat are bad. I highly doubt that the cat is bad.
Re: 04 SLE P0420 code day after passes inspection
Posted: Wed Jun 03, 2020 8:12 am
by nos4blood70
At least it happened right after the inspection. Haha
Re: 04 SLE P0420 code day after passes inspection
Posted: Wed Jun 03, 2020 8:31 am
by harofreak00
luke_dubs wrote:EVAP system could actually have a problem, or the oxygen sensors on either side of the cat are bad. I highly doubt that the cat is bad.
Ummm, no. The P0420 is almost always a bad cat.
Re: 04 SLE P0420 code day after passes inspection
Posted: Sat Jun 06, 2020 11:33 pm
by Jdub34
Thanks guys. The exhaust is really rattling in the area of the cat so I'm thinking the crap came loose inside. Just crazy how it threw the code day after inspection.
Re: 04 SLE P0420 code day after passes inspection
Posted: Sun Jun 07, 2020 1:43 am
by 96 SSEi
the pcm gets cat info directly from the O2 sensor near the cat - get that checked out first.
Re: 04 SLE P0420 code day after passes inspection
Posted: Wed Jun 10, 2020 4:57 pm
by MKMike
nos4blood70 wrote:At least it happened right after the inspection. Haha
Gives you a bit more time to address the issue.