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Code P0420 2003 SSEi
Posted: Sat Sep 14, 2013 5:11 pm
by rynmcdonald
That's my trouble code. I don't know if it's being set because I am running one step colder plugs OR that it's just seen better days and needs replaced. I tried clearing the code with an OBD II scantool and it came back on after 100 miles. I just hope that it's the sensor alone and nothing else.
Re: Code P0420 2003 SSEi
Posted: Wed Sep 18, 2013 1:31 am
by maroon111993
Don't know if the bonnevilles have them but have you checked your O2 sensor behind your cat? I get this code every once in awhile (but that's because I actually removed my cat haha)
P0420 DTC Code - Catalyst System Efficiency Below Threshold
Not a major issue other than emissions... just an annoying Check Engine Light. haha