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P0420 code ??? Help http://www.pontiacbonnevilleclub.com/forum/2000-2005-other-than-gxp/topic51231.html |
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Author: | cvcman [ Wed Dec 06, 2017 7:38 pm ] |
Post subject: | P0420 code ??? Help |
CEL came on today, scanner says above code,,,car has 195k on it...how do I know IF its the convertor or the 02 sensor ?? Thx |
Author: | 96 SSEi [ Thu Dec 07, 2017 10:05 am ] |
Post subject: | Re: P0420 code ??? Help |
if you have a scanner that reads rediness, you can see if the o2 sensor passed its self-diagnostic. if it did, sensor is ok but still could be many causes look here....http://www.easterncatalytic.com/educati ... 420-codes/ |
Author: | nos4blood70 [ Thu Dec 07, 2017 1:41 pm ] |
Post subject: | Re: P0420 code ??? Help |
After 195k miles, it's probably the cat. |
Author: | kc9dre [ Tue Dec 12, 2017 12:30 am ] |
Post subject: | Re: P0420 code ??? Help |
I am at 183k and mine is doing this as well. I use Torque Pro to log the data and check readiness. I can clear it and it comes back... Cat is not clogged so I am running it as it is for now as we do not smog check and if they do they just look for codes... delete in the parking lot and pray it don't flag when tested when we did have testing here. I will eventually get it replaced when it warms up. and I replace the exhaust system... |
Author: | cvcman [ Mon Dec 18, 2017 9:00 pm ] |
Post subject: | Re: P0420 code ??? Help |
I did the spark plug non fouler mod to the rear 02 sensor,,,light has been off for almost 200 miles |
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