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Author Topic: P0420  (Read 7487 times)

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Proz

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P0420
« on: 21 October 2008, 20:00:48 »
Hi all ... had my engine light come on today and its reading P0420 Catalyst Efficiency Below Threshold ....does this mean the cats gone . They said they replaced it before i bought it 5 months ago  :-/
« Last Edit: 21 October 2008, 20:01:17 by Mark38 »
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Entwood

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Re: P0420
« Reply #1 on: 21 October 2008, 20:03:52 »
If you had 1000 more cc's I'd know the answer .. 'tis a common fault on the 3.2's ... but the 2.2 I believe is totally different ...

Hopefully someone who knows will enlighten us soon ..  :y :y :y
« Last Edit: 21 October 2008, 20:04:20 by entwood »
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Albatross

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Re: P0420
« Reply #2 on: 21 October 2008, 20:07:56 »
Does the 2.2 have the same pre-cat arrangement and 2 lambdas; one before the pre-cat and one after?

Perhaps the code is related to the same issue, but it can only have it on the one "side" as it were?
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Proz

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Re: P0420
« Reply #3 on: 21 October 2008, 20:09:28 »
Im a mechanical novice so i dont know how many and where anything is really  :-[
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Proz

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Re: P0420
« Reply #4 on: 21 October 2008, 20:10:40 »
It said the above code " bank 1 " if that makes any difference .
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wingman

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Re: P0420
« Reply #5 on: 21 October 2008, 20:14:31 »
Sounds like the problem that Kevin is describing in his recent post on the Technical Info section.
www.omegaowners.com/forum/YaBB.pl?num=1223977027
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Proz

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Re: P0420
« Reply #6 on: 21 October 2008, 20:16:51 »
Quote
Sounds like the problem that Kevin is describing in his recent post on the Technical Info section.
www.omegaowners.com/forum/YaBB.pl?num=1223977027

Thanks ...i'll have a wee look  :y
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Albatross

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Re: P0420
« Reply #7 on: 21 October 2008, 20:21:38 »
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Im a mechanical novice so i dont know how many and where anything is really  :-[

Sorry the question was really aimed at the forum members generally. If the answer to my question above is yes, then I think I may have an explanation and a solution, but t is a bit of an undertaking.

If the answer is no, then I've nothing of much value to add as a novice myself.
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markey mark

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Re: P0420
« Reply #8 on: 21 October 2008, 20:24:49 »
Quote
Does the 2.2 have the same pre-cat arrangement and 2 lambdas; one before the pre-cat and one after?

Perhaps the code is related to the same issue, but it can only have it on the one "side" as it were?

yes exactly the same  :y
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Albatross

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Re: P0420
« Reply #9 on: 21 October 2008, 20:25:48 »
Looks like the answr is "yes".

And Kevins Wood explains it incredibly well.

I have found and implemented a solution on my 3.2, but the principle is identical for your car. The latter part of this thread explains what I have done.

http://www.omegaowners.com/forum/YaBB.pl?num=1214690650

 I did this on a new stainless cat-back exhaust, but a new lambda boss could be added into a standard exhaust if you wanted to.


« Last Edit: 21 October 2008, 20:30:47 by Albatross »
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Proz

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Re: P0420
« Reply #10 on: 21 October 2008, 20:27:29 »
Does this mean that one of the lambdas is possibly acting up .... or is there something more going on here.... :-[
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markey mark

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Re: P0420
« Reply #11 on: 21 October 2008, 20:28:37 »
take your car out and give it a damn good thrashing bud should clear it !!  :y :y
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Proz

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Re: P0420
« Reply #12 on: 21 October 2008, 20:31:49 »
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take your car out and give it a darn good thrashing bud should clear it !!  :y :y

I like the sound of that  ;D ;D :y
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Albatross

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Re: P0420
« Reply #13 on: 21 October 2008, 20:34:11 »
Quote
Does this mean that one of the lambdas is possibly acting up .... or is there something more going on here.... :-[

Kevin Woods words

"Another issue which is often grouped with fuel trim, although not necessarily related is the appearance of "cat efficiency" (0420 and 0430) codes on the newer Omegas with 2.2, 2.6 and 3.2 engines. Everything we have discussed above regarding fuel trim relates to the front "pre-cat" Lambda sensors. These engines have a second set of Lambda sensors after a small "pre-cat" in the exhaust elbow.

The only purpose of these "post-cat" Lambda sensors is to determine if the pre-cats are working effectively and to light the emissions light if there is a problem. They are not involved in fuel trim at all - for a very good reason. "


In simple terms your lambda sensors are fine. The 1st (pre) cat is a little tired when cold and the 2nd lambda sensor thinks that the air hasn't been "cleaned" enough in going through that 1st cat.

You can resolve the issue by "tricking" the 2nd lambda sensor and moving behind both cats. The air is then "cleaned" twice by both cats before getting as far as the 2nd sensor and the 2nd lambda sensor is "happy" and you lose the EML warning.
« Last Edit: 21 October 2008, 20:35:51 by Albatross »
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tunnie

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Re: P0420
« Reply #14 on: 21 October 2008, 20:34:31 »
Quote
Quote
take your car out and give it a darn good thrashing bud should clear it !!  :y :y

I like the sound of that  ;D ;D :y

A lot has to be said of that, usually its diesels really, as they clog up with the clouds of smoke some of the older ones make. A damn good trashing does them good, maybe try a tank full of BP Ultimate and give it damn good spanking on the whole tank, and see if that clears it.

Have you replaced the plugs recently? got any oil in the cylinders? I did that  ::)

Had clouds of blue smoke for about 30 seconds!  ;D
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