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July 24th, 2007, 01:03 AM
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#1 |
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Regular
Join Date: Jul 2006
Posts: 328
 iTrader: 0 reviews
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Code Help
Alright this is the second time in about 2 months that my CEL came on. I went the first time and it came up with P0420. Which is the O2 sensor is below threshold or something like that. The guy that time told me to wait and see if it comes back on becuase it could mean something else. Now it came back after two months of it being off and its the same thing. They guy this time told me that will keep going off because I dont have any cats. Is this right or is my O2 sensor bad?
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July 24th, 2007, 01:07 AM
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#2 |
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Hardcore Enthusiast
2004 Mustang GT Conv.
Join Date: Mar 2007
Location: Edgewater, FL
Posts: 1,793
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http://www.obd-codes.com/trouble_cod...old-bank-1.php
If you don't have cats it shouldn't set it off... I'd guess the 02 sensor
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 2004 GT Boosted by Vortech |
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July 24th, 2007, 02:19 AM
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#3 |
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I Post Entirely Way Too Much
2005 Cadillac STS V8
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Join Date: Dec 2006
Location: Upstate NY
Posts: 6,344
iTrader: 3 reviews
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If you don't have cats you need mil eliminators or to turn them off with a hand held tuner. really easy to fix.
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July 24th, 2007, 07:56 AM
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#4 | |
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Hardcore Enthusiast
2002 Mustang GT
Join Date: May 2007
Location: Savannah, Ga
Posts: 2,789
iTrader: 3 reviews
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July 24th, 2007, 09:40 AM
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#5 |
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Regular
Join Date: Jul 2006
Posts: 328
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well the back ones never turn throw a CEL just the front ones. There was a tune put on the car before.
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July 24th, 2007, 10:25 AM
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#6 |
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Hardcore Enthusiast
2002 Mustang GT
Join Date: May 2007
Location: Savannah, Ga
Posts: 2,789
iTrader: 3 reviews
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Thats funny, I always thought below threshold was bad cats. Which would mean the o2 sensor in the back is tripping. It is the one that measures the cats. Maybe I was wrong though.
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July 24th, 2007, 10:28 AM
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#7 |
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Hardcore Enthusiast
2002 Mustang GT
Join Date: May 2007
Location: Savannah, Ga
Posts: 2,789
iTrader: 3 reviews
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Nope, I checked. Thats what it means. The one in the back is the one detecting the problem. Catalyst below threshold. If thats the code you're getting.
http://www.obd-codes.com/trouble_cod...old-bank-1.php
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July 24th, 2007, 07:51 PM
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#8 |
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Regular
Join Date: Jul 2006
Posts: 328
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OHH! I thought it was the one up front. Ok so I guess I just need to break down and finally buy the damn tuner that I have been thinking of buying forever.
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July 24th, 2007, 07:52 PM
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#9 |
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Regular
Join Date: Jul 2006
Posts: 328
iTrader: 0 reviews
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and yes thats the one I am getting
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