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Author Topic: P0420 - Catalyst Efficency Above Threshold - on 2.2  (Read 5911 times)

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chrisgixer

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Re: P0420 - Catalyst Efficency Above Threshold - on 2.2
« Reply #15 on: 31 March 2015, 21:52:11 »
,oh ok. So just shite cats then. :-\
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steve6367

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Re: P0420 - Catalyst Efficency Above Threshold - on 2.2
« Reply #16 on: 31 March 2015, 21:53:04 »
Quote from: TheBoy on 31 March 2015, 21:22:16
Quote from: chrisgixer on 31 March 2015, 12:22:08
What's the code? If 0420 (which I think is bank 1, as yours obviously won't have the bank 2 code) is present, then yes moving the sensor location will fix it.

Correction, code as title ::) ;D

:y
[/quote]
2.2 doesn't have a starting cat, does it?  :-\

Thus no option to move lamda beyond main cat as already there...

It does / should - certainly my original VX ones does have 2 CATs - in line. After market 2.2 setups don't often seem to though.

From what I can see, Lambda sensor no 2 is down stream of the second (main / big) CAT so I am not sure moving it is a useful option :-(
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steve6367

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Re: P0420 - Catalyst Efficency Above Threshold - on 2.2
« Reply #17 on: 31 March 2015, 21:54:48 »
How is the code produced? What output is it looking for from Lambda no 2 to determine the CAT is stuffed? Can it be the sensor, or is this code always the CAT?
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chrisgixer

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Re: P0420 - Catalyst Efficency Above Threshold - on 2.2
« Reply #18 on: 31 March 2015, 22:18:16 »
This is the image is wanted but it's the v engine one. So nfg

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steve6367

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Re: P0420 - Catalyst Efficency Above Threshold - on 2.2
« Reply #19 on: 31 March 2015, 22:54:07 »
Thank you - I'll get under the car tomorrow and double check where the second senior is  :y
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steve6367

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Re: P0420 - Catalyst Efficency Above Threshold - on 2.2
« Reply #20 on: 31 March 2015, 22:56:36 »
I have fitted one of these, but not on my car. Looks like the second sensor is already post main cat though....

http://www.cats2u.co.uk/popup_image.php?pID=32298&image=0

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chrisgixer

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Re: P0420 - Catalyst Efficency Above Threshold - on 2.2
« Reply #21 on: 31 March 2015, 23:12:47 »
Yes that's what TB implied. Sorry. ...up the garden path with that one.  :-[
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steve6367

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Re: P0420 - Catalyst Efficency Above Threshold - on 2.2
« Reply #22 on: 31 March 2015, 23:21:40 »
No worries  :y

Does anyone know how the ecu arrives at that code?
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tunnie

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Re: P0420 - Catalyst Efficency Above Threshold - on 2.2
« Reply #23 on: 01 April 2015, 10:22:00 »
Quote from: TheBoy on 31 March 2015, 21:24:21
Yup, courtesy of Mr Tunnie, can clearly show 2nd sensor already behind main cat:



Yes, 2 cats on 2.2 as well. That's the original cat, never touched sensors or anything with it. Unlike the crappy V6 DBW design, it does not need sensors moving.

As others have indicated, cannot stress enough to either keep the original CAT or replace with another known GM from a breaker.

Perhaps HG failure speeded up a sensor failure? I'd look at getting known good ones from breaker here and replace them, give the thread area a blast of plusgas a couple of days before.

Plenty of room around 2.2 zorst to remove the sensors.

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steve6367

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Re: P0420 - Catalyst Efficency Above Threshold - on 2.2
« Reply #24 on: 01 April 2015, 10:29:14 »
Thank you - popped sensors out this morning and both 'look ok'.

I have a couple of spares here, so have swapped the post CAT one to see if that makes any difference.

Found this when under there:



Could that cause the problem? Or will getting it welded up be a waste of money?

In live data what should the post CAT lambda look like?

Steve
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tunnie

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Re: P0420 - Catalyst Efficency Above Threshold - on 2.2
« Reply #25 on: 01 April 2015, 10:39:33 »
Well that's enough to cause a blow, I've had mine completely go bang and not be attached the to flexi at any point. Still did not cause error codes for me, although it was not driven far after that occurred! Was luckily just after a speed bump near home.

You need to get it welded up, get a replacement flexi off eBay, think size is 50x100 (let me double check)

Drop the cat section, it's dead easy on 2.2 with loads of room. Then take the cat section to a place who does welding, if you can visit master in Nottingham I'd highly reccommend it.  :y
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steve6367

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Re: P0420 - Catalyst Efficency Above Threshold - on 2.2
« Reply #26 on: 01 April 2015, 10:41:47 »
Right I shall get back out there and get it off! Got to go to Doncaster on Monday so no pressure! It does not sound like it's blowing btw but I guess you have to fix the faults you can see first.

Steve
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tunnie

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Re: P0420 - Catalyst Efficency Above Threshold - on 2.2
« Reply #27 on: 01 April 2015, 10:43:21 »
This was the state of mine, before it was changed:

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steve6367

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Re: P0420 - Catalyst Efficency Above Threshold - on 2.2
« Reply #28 on: 01 April 2015, 10:47:24 »
Wow, that was stuffed!

Just made some calls and can get the flexi replaced today for £120 - might have to go for that given the time pressure  :-\
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Re: P0420 - Catalyst Efficency Above Threshold - on 2.2
« Reply #29 on: 01 April 2015, 10:50:32 »
Quote from: steve6367 on 01 April 2015, 10:47:24
Wow, that was stuffed!

Just made some calls and can get the flexi replaced today for £120 - might have to go for that given the time pressure  :-\

What is the breakdown on that?

Part is ~£10...

http://www.ebay.co.uk/itm/2-UNIVERSAL-51MM-EXHAUST-PIPE-FLEXI-FLEX-REPAIR-TUBE-JOIN-2-X-4-650100-/371144483891?pt=LH_DefaultDomain_3&hash=item5669ef6433

Took all of master around 30mins maybe to change? Including a tea break!

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