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Adam
Dodge Dakota
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7/02/2006
15:47:03

Subject: P0420
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Ok so my truck thought it would be fun to throw this code out last night. Something about an inefficient catalyst or what not? Anybody else have this problem? I'm thinkin maybe my catalytic converter died or something. I replaced my O2 sensor not too long ago so I dont think that's the problem. I have a superchips and am currently running it on the peroformance mode w/ 92 octane but on this last fillup I went with 89. Could that be a reason? Any help would be much appreciated. Thanks.



Tyler
Dodge Dakota
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7/04/2006
16:19:38

RE: P0420
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Just got a book today with the codes in it. P0420 reads (Catalyst System efficiency below threshold) (left cylinder bank). Hope that helps.



modain
GenIII
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7/05/2006
14:07:51

RE: P0420
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The Powertrain Diagnostics manual states the reason for the condition is the difference between the pre and post cat O2 sensor readings are too close together. (Meaning: the sensors are not measuring properly, or the cat isn't working.) Possible causes are worn out sensors or degraded cat.

The first thing to check/replace is the sensors. You must change both, not just the post O2 sensor. Otherwise, you'll run into other O2 sensor codes.

The expected life expectancy of an O2 sensor is between 80-100K miles.

What year / engine do you have? Is it a California or Federal emssions truck? How many miles are on it? Are they the original sensors? Etc.

What's your left foot doing?
=========================================
2002 Graphite QC SLT Plus, 4.7L, NV3500, Superchips 3715, 3.92 LSD, loads o'fun...
2001 Patriot Blue Durango SLT, 4.7L, 45RFE, Superchips 3715, 3.55 Open (for now)
1999 Forest Green Dakota RC Sport, 2.5L, NV1500, 3.55 Open


Adam
Dodge Dakota
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7/05/2006
16:08:24

RE: P0420
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I replaced my o2 sensor after the cat probably about 4-5k mi ago. I dont think my truck is cali emissions but I'm not sure. I used to live in oregon and that's where I got it. Right now I have 116k on it. '00 3.9



modain
GenIII
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7/05/2006
18:49:02

RE: P0420
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I have read from a few sources that if both the pre and post sensors don't get changed together you will often times get the P0420. Change your front O2 sensor, clear the code, and if it comes back then you might address the cat.

What's your left foot doing?
=========================================
2002 Graphite QC SLT Plus, 4.7L, NV3500, Superchips 3715, 3.92 LSD, loads o'fun...
2001 Patriot Blue Durango SLT, 4.7L, 45RFE, Superchips 3715, 3.55 Open (for now)
1999 Forest Green Dakota RC Sport, 2.5L, NV1500, 3.55 Open


Adam
Dodge Dakota
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7/05/2006
21:44:04

RE: P0420
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I erased my code a few days ago but I havne't done really any driving yet to see if it comes back. I hope it doens't because I really dont want to spend the money on another O2 sensor...but hey if I have to oh well. Thanks



duhqota
Dodge Dakota
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7/06/2006
14:28:01

RE: P0420
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I got a '96 Dakota 3.9L, it's only got about 70k miles now, but when I first got it 55k miles, the cat was broken apart inside. With the engine off, "cat" cool, smack with a mallet of sorts, if it rattles I'd go with replacing it. I put on a Hedman- high flow cat, could tell the difference running right away at higher rpms, also. No problems with eng.light before or after.



duhqota
Dodge Dakota
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7/06/2006
14:33:33

RE: P0420
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Oh, if it's OBDII you're emission legal, but you'll have to do a decent amout of driving in several different situations for it to completly clear. There is a whole process in the computer that needs to be met.



Scott C
Dodge Dakota
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7/06/2006
21:36:37

RE: P0420
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most common fault is up stream 02 the one befor cat has gotten lazy.... thats the 02 that does more work cause of its heater circuit.... try replacing that one.... if it doesnt help then your cat has gone bad and needs replacing.... theres not a whole lot of test for that code... its ethier bad 02 or bad cat....

Scott C
Royal Auto



help
Dodge Dakota
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12/24/2007
22:50:16

RE: P0420
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I have the same code but it only comes on when i go down the highway at 55-65mph also my foot is off the gas if about 10secs other than that It does not come on help



Darren
Dodge Dakota
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2/16/2013
21:17:08

RE: P0420
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I had that code on my '06 4.7 HO AWD. Had p0420 and
p0430(both banks). It caused me to fail aircare. I had it in the
shop and was told that I probably need to replace both cats.
The thing is, I also have an exhaust leak at the manifold. I
understand that this can also trigger those codes. They
cleared the codes and sent me on a long drive. I then passed
aircare as the codes did not return yet, but I know they will.
Can anyone confirm that the exhaust leak can trigger these
codes?



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