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PostPosted: Fri May 29, 2020 9:14 pm 
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Year and Trim: 2004 SLE
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.


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PostPosted: Tue Jun 02, 2020 10:23 am 
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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.

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PostPosted: Wed Jun 03, 2020 8:12 am 
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At least it happened right after the inspection. Haha

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PostPosted: Wed Jun 03, 2020 8:31 am 
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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.


#-o Ummm, no. The P0420 is almost always a bad cat.

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PostPosted: Sat Jun 06, 2020 11:33 pm 
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Year and Trim: 2004 SLE
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.


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PostPosted: Sun Jun 07, 2020 1:43 am 
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Year and Trim: 2000 Bonniville SSEi L67
the pcm gets cat info directly from the O2 sensor near the cat - get that checked out first.

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PostPosted: Wed Jun 10, 2020 4:57 pm 
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nos4blood70 wrote:
At least it happened right after the inspection. Haha


:beerchug: Gives you a bit more time to address the issue.


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