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Olindo
Dodge Dakota
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7/20/2009
13:08:50
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 Subject: P0420 help
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Message:
Hi all. Thanks for all the help in the past...but now I have a new prob. Check Engine light came on yesterday and the boys down at advanced auto parts were kind enough to scan the OBD for free. The scan showed my 99 Dak (3.9L V6, 81k miles) threw code P0420. Can anyone tell me what that is and if I can fix myself?
Thanks,
Olindo
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daddio
Dodge Dakota
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7/20/2009
13:51:21
|  RE: P0420 help
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P0420 Catalyst System Efficiency Below Threshold (Bank 1)
Sounds like either the downstream O2 sensor or the catcon is going bad.
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Olindo
Dodge Dakota
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7/20/2009
15:21:55
| RE: P0420 help
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Message:
Thanks Daddio. Since the truck seems to be running fine, I raised an eyebrow when the autozone guy said upstream sensor...when I know the downstream sensor give catcon feedback. Thanks for confirming what I expected. I think it's easier to start w/ sensor replacement. Any tips on replacement, sensor manufacturer's to avoid...etc?
Thanks,
Olindo.
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daddio
Dodge Dakota
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7/20/2009
16:07:34
| RE: P0420 help
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Message:
If you can find them locally, the NGK/NTK brand have gotten good reviews from some people here. You can buy them direct from NGK through their website. And if it were me, I'd buy the stock replacement and not the universal fit. You would have to cut and solder your old connector with the universal. But hey, if you're comfortable splicing and soldering go for it and save a few more bucks.
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Olindo
Dodge Dakota
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8/06/2009
13:08:46
| RE: P0420 help
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Message:
Hey Daddio...need advice. So I order the O2 sensor and it comes in about 5 days later. I wait until the weekend to replace it...but by then the CEL goes out. Should I replace it anyway and, with my luck, risk breaking something that ain't broke..or just leave it be until the light comes on again?
thanks,
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daddio
Dodge Dakota
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8/06/2009
13:27:12
| RE: P0420 help
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Message:
Like the old saying goes " If it ain't broke, don't fix it." Save it for later. That code coming up could have been just a ghost in the machine.
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Olindo
Dodge Dakota
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8/08/2009
11:12:03
| RE: P0420 help
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Message:
Thanks for the advice.
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sffire13
Dodge Dakota
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12/12/2010
20:37:56
| RE: P0420 help
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Message:
hi i have the same problem in my V8 dakota 2005 but the truck is randomly stalling out on me any advice? could the two be conected?
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