P0420 code and I need to pass smog
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Junior Member
Joined: Mar 2016
Posts: 1
From: southern california
P0420 code and I need to pass smog
Hello, two years ago my 08 H3 threw a P0430 code. I was naive and had the dealer replace the cat converter so I would pass my smog. One week later, the CEL went back on and it was a P0420 code. The dealer said I needed a new “right bank” cat converter. Nothing is wrong with my hummer. It’s running fine. Fast forward two years later, the code is still there and I need my car smogged again. I cleared the code and was told by the smog test operator that everything passed but I needed to reset the driving cycle. He told me to drive for 80 miles and come back. The problem is that after 49 miles the CEL comes back on with the P0420 code. What can I do? Thanks in advance.
Senior Member
Joined: Jul 2013
Posts: 590
From: Virginia
Hello, two years ago my 08 H3 threw a P0430 code. I was naive and had the dealer replace the cat converter so I would pass my smog. One week later, the CEL went back on and it was a P0420 code. The dealer said I needed a new “right bank” cat converter. Nothing is wrong with my hummer. It’s running fine. Fast forward two years later, the code is still there and I need my car smogged again. I cleared the code and was told by the smog test operator that everything passed but I needed to reset the driving cycle. He told me to drive for 80 miles and come back. The problem is that after 49 miles the CEL comes back on with the P0420 code. What can I do? Thanks in advance.
Senior Member
Joined: Oct 2011
Posts: 1,655
From: Wisconsin
I'm in no way advocating the defeat of federal and state laws an by sharing this video link on YouTube it is for entertainment purposes only.... This is not my content nor did I create it. But lol it just might help you.
Last edited by Happy Hummer; Oct 19, 2018 at 08:55 AM.
Member
Joined: Jul 2016
Posts: 97
Had that code come up 2 years ago. Went the cheap route and had a fouler installed (the spacer bolt thing, as someone posted above). That "tricks" the o2 sensor into reading cleaner air, as it "spaces" it back further away from the o2 hole. Kept the engine light off permanently. Had the same code come up for my other bank 2 sensor, and did the same there.
Lasted me over 2 years before the cats started to rattle a lot, meaning the internal parts were breaking down. I just had both replaced, and put new o2 sensors on without those foulers, and the code did not come back (as they are now both "efficient" cats).
FYI in the 2+ years that I had those spacers on, I noticed no difference in any performance or anything at all. Except that it kept my engine light off! Passed all emission tests too.
Lasted me over 2 years before the cats started to rattle a lot, meaning the internal parts were breaking down. I just had both replaced, and put new o2 sensors on without those foulers, and the code did not come back (as they are now both "efficient" cats).
FYI in the 2+ years that I had those spacers on, I noticed no difference in any performance or anything at all. Except that it kept my engine light off! Passed all emission tests too.
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