Omega Owners Forum

Omega Help Area => Omega General Help => Topic started by: davidinhampton on 13 October 2014, 16:02:47

Title: Fault Code P0420 Catalyst Low Bank 1
Post by: davidinhampton on 13 October 2014, 16:02:47
I have an Omega 2.6 V6 Estate 03 plate and I had the above error code come up. Initially the garage changed the sensor but within 6 days I had the management light up again. They then changed the Bank 1 Catalytic Converter again this worked for about a week then the light came up again. The car has gone in twice and they have fitted spacers but on both occasions within days the same error comes up. I am now being told I will probably have to have a Vauxhall Manufactured Cat fitted and they apparently cost an arm and a leg.

Has anybody come across this before and if so what did you do to solve it ?

Many Thanks

Dave
Title: Re: Fault Code P0420 Catalyst Low Bank 1
Post by: 05omegav6 on 13 October 2014, 16:10:51
Well documented... the sensors need moving down the exhaust. Can be done for less than the cost of a sensor.

Expect a P0430 code for bank 2 soon as well ::)

Refit the original cat, then add two cans of Wynns injector/fuel treatment to a full tank of Shell V power. Then rag the living daylights out of it, if you get more than 240 miles from this tank, then you aren't trying.

This will clean everything and should turn the light off in the process. Ultimately though, the only cure is to move the sensors :y
Title: Re: Fault Code P0420 Catalyst Low Bank 1
Post by: 05omegav6 on 13 October 2014, 16:11:59
I have an Omega 2.6 V6 Estate 03 plate and I had the above error code come up. Initially the garage changed the sensor but within 6 days I had the management light up again. They then changed the Bank 1 Catalytic Converter again this worked for about a week then the light came up again. The car has gone in twice and they have fitted spacers but on both occasions within days the same error comes up. I am now being told I will probably have to have a Vauxhall Manufactured Cat fitted and they apparently cost an arm and a leg.

Has anybody come across this before and if so what did you do to solve it ?

Many Thanks

Dave
If it's only been on a week, try and get a refund for the cat, as there was nothing wrong with the old one :y
Title: Re: Fault Code P0420 Catalyst Low Bank 1
Post by: Marks DTM Calib on 13 October 2014, 16:44:17
That's very very poor diagnosis by the garage and resulting in a big bill for an un-needed cat section which will be of much lower quality than the original. :y
Title: Re: Fault Code P0420 Catalyst Low Bank 1
Post by: davidinhampton on 13 October 2014, 16:49:03
Unfortunately the old Cat has gone and the replacement has been on for about 3 weeks......would you think trying would you suggested will clear this up with the new "rated" Cat fitted ?
Title: Re: Fault Code P0420 Catalyst Low Bank 1
Post by: Webby the Bear on 13 October 2014, 16:57:59
Unfortunately the old Cat has gone and the replacement has been on for about 3 weeks......would you think trying would you suggested will clear this up with the new "rated" Cat fitted ?
Surely a refund of the part!!!!  >:(
Title: Re: Fault Code P0420 Catalyst Low Bank 1
Post by: TheBoy on 13 October 2014, 17:55:49
Oh dear, I know its a bit late now, but you now have an inferior, not up to specification cat, and are a few hundred quid lighter, all due to poor diagnosis by your garage  >:(

The solution is to move the sensor...  ...though you may always regret having that pattern cat on there  :'(
Title: Re: Fault Code P0420 Catalyst Low Bank 1
Post by: carswaps on 13 October 2014, 18:04:39
I get the 0420 and 0430 at least once a week! I just live with turning it off with my code reader but will move the sensors eventually.
Title: Re: Fault Code P0420 Catalyst Low Bank 1
Post by: TheBoy on 13 October 2014, 18:09:33
I get the 0420 and 0430 at least once a week! I just live with turning it off with my code reader but will move the sensors eventually.
You're not alone - Mrs TB gets it when she uses TBE. I never have, she clearly is driving like tunnie.
Title: Re: Fault Code P0420 Catalyst Low Bank 1
Post by: TheBoy on 13 October 2014, 18:10:36
Actually, thanks, reminds me I need to find the tech2 (could be anywhere) and reset codes on TBE - the eml wont go out by itself
Title: Re: Fault Code P0420 Catalyst Low Bank 1
Post by: VXL V6 on 13 October 2014, 18:43:39
Actually, thanks, reminds me I need to find the tech2 (could be anywhere) and reset codes on TBE - the eml wont go out by itself
Funnily enough... It does. Usually after 600ish motorway miles.... Of course, a day after driving on normal roads it's back on!

 
Title: Re: Fault Code P0420 Catalyst Low Bank 1
Post by: amba on 13 October 2014, 20:40:26
Had a similar issue with my 3.2 bringing up fault codes running on standard unleaded even though it would only do it when just poddling around town,good motorway run it wouldnt come on.

Just to test I ran a tank of Shell V and despite slow town driving light didn,t come back on.For the past 2.5k miles have used Shell V and whilst it maybe a few pence a litre more ,light has never reappeared so will continue with the more expensive fuel as slight perk of my job is its all tax deductable  ;)
Title: Re: Fault Code P0420 Catalyst Low Bank 1
Post by: Marks DTM Calib on 14 October 2014, 08:32:45
I get the 0420 and 0430 at least once a week! I just live with turning it off with my code reader but will move the sensors eventually.
You're not alone - Mrs TB gets it when she uses TBE. I never have, she clearly is driving like tunnie.

I thought we moved the sensors on that one?
Title: Re: Fault Code P0420 Catalyst Low Bank 1
Post by: chrisgixer on 14 October 2014, 08:38:28
I get the 0420 and 0430 at least once a week! I just live with turning it off with my code reader but will move the sensors eventually.
You're not alone - Mrs TB gets it when she uses TBE. I never have, she clearly is driving like tunnie.

I thought we moved the sensors on that one?
Nah. Just welded in the bosses to the new location. Iirc he later discovered the sensors won't budge. (And is too tight to buy new ones.....or indeed used ones ;D )
Title: Re: Fault Code P0420 Catalyst Low Bank 1
Post by: TheBoy on 14 October 2014, 21:35:40
I get the 0420 and 0430 at least once a week! I just live with turning it off with my code reader but will move the sensors eventually.
You're not alone - Mrs TB gets it when she uses TBE. I never have, she clearly is driving like tunnie.

I thought we moved the sensors on that one?
You tried. You failed ;D

Given you failed, I didn't even try  :-[.  As Gixer says, needs new sensors...  ...but looking at trims, I think it may possibly need new injectors as well.  Needless to say, no issues when I drive it...
Title: Re: Fault Code P0420 Catalyst Low Bank 1
Post by: chrisgixer on 15 October 2014, 00:39:56
I get the 0420 and 0430 at least once a week! I just live with turning it off with my code reader but will move the sensors eventually.
You're not alone - Mrs TB gets it when she uses TBE. I never have, she clearly is driving like tunnie.

I thought we moved the sensors on that one?
You tried. You failed ;D

Given you failed, I didn't even try  :-[.  As Gixer says, needs new sensors...  ...but looking at trims, I think it may possibly need new injectors as well.  Needless to say, no issues when I drive it...
Your lpg nozzels are still too big though, aren't they? Or did you sort that out?
Title: Re: Fault Code P0420 Catalyst Low Bank 1
Post by: mickyboy123 on 15 October 2014, 07:37:51
Have had a pattern cat fitted to my 2.2 just about 2 weeks ago , havnt had any lights come on yet. But i have had my original cat welded with a new flexi joint for a bakup. The only problem i have the top cat is much biger than the original and there is very little clearance  with the stearing joint not sure if its called the drop link but on a hard right turn they make contact .its was a react cat that i have apart from that im very pleased with it very quite. :y
Title: Re: Fault Code P0420 Catalyst Low Bank 1
Post by: davidinhampton on 15 October 2014, 17:45:47
Thanks for all the replies just to show my ignorance i didnt even know a V6 had 2 cats lol. I will go speak with the Garage and see if they can move the sensors and see if that helps  :y
Title: Re: Fault Code P0420 Catalyst Low Bank 1
Post by: 05omegav6 on 15 October 2014, 18:18:35
Thanks for all the replies just to show my ignorance i didnt even know a V6 had 2 cats lol. I will go speak with the Garage and see if they can move the sensors and see if that helps  :y
They actually have four... and if going to the same garage, I would politely suggest that they do the work for free whilst refunding you the money they would have received when they scrapped your perfectly sound cats :y
Title: Re: Fault Code P0420 Catalyst Low Bank 1
Post by: TheBoy on 15 October 2014, 20:07:26
I get the 0420 and 0430 at least once a week! I just live with turning it off with my code reader but will move the sensors eventually.
You're not alone - Mrs TB gets it when she uses TBE. I never have, she clearly is driving like tunnie.

I thought we moved the sensors on that one?
You tried. You failed ;D

Given you failed, I didn't even try  :-[.  As Gixer says, needs new sensors...  ...but looking at trims, I think it may possibly need new injectors as well.  Needless to say, no issues when I drive it...
Your lpg nozzels are still too big though, aren't they? Or did you sort that out?
I melted the replacements :(

But its noticibly grumpy now until warmed, I believe you had this?
Title: Re: Fault Code P0420 Catalyst Low Bank 1
Post by: chrisgixer on 15 October 2014, 20:26:35
I get the 0420 and 0430 at least once a week! I just live with turning it off with my code reader but will move the sensors eventually.
You're not alone - Mrs TB gets it when she uses TBE. I never have, she clearly is driving like tunnie.

I thought we moved the sensors on that one?
You tried. You failed ;D

Given you failed, I didn't even try  :-[.  As Gixer says, needs new sensors...  ...but looking at trims, I think it may possibly need new injectors as well.  Needless to say, no issues when I drive it...
Your lpg nozzels are still too big though, aren't they? Or did you sort that out?
I melted the replacements :(

But its noticibly grumpy now until warmed, I believe you had this?
...still do to an extent, but it's not engine temp related. Build up of fuel trim at tick over I guess as it does eventually start to hunt after two or three minutes at idle.

The lpg map is a bit vague to map at low rpm, but I minimised mine by lowering the map parameters at tickover rpm levels. I presume its giving too much fuel at tickover, and being trimmed back and the cycle repeats.

My current Hanna injectors have no nozzels and do it all by duration. A bit of a pig to map as they are the complete opposite end if the map scale to the moto gas ones. The lambdas where not switching at all initially as it was way too rich working with the motogas map. But got there In the end.

Currently, there is a hunt that creeps in after 2/3 mins at idle, and it's set to switch back to petrol over 5.5k rpm. I'm sure these things could be tuned out though, if I could be arsed.


Yours however, needs smaller nozzels. No point changing anything until they're sorted, surely?

Title: Re: Fault Code P0420 Catalyst Low Bank 1
Post by: TheBoy on 15 October 2014, 20:29:15
Given the step change, I thought something else was toast, and you had better success with you new injectors, I was thinking not worth the bother, just swap 'em.  But, yeah, too big to idle, immediate hunting at idle.
Title: Re: Fault Code P0420 Catalyst Low Bank 1
Post by: TheBoy on 15 October 2014, 20:30:16
Though if I scrap the Bullet, I could try the Valteks, they are indestructible ;D
Title: Re: Fault Code P0420 Catalyst Low Bank 1
Post by: Kevin Wood on 15 October 2014, 20:45:59
Though if I scrap the Bullet, I could try the Valteks, they are indestructible ;D

Mine don't bog down at high RPM either, since I rebuilt them... They just hunt at idle instead. ::)
Title: Re: Fault Code P0420 Catalyst Low Bank 1
Post by: chrisgixer on 15 October 2014, 21:08:14
Though if I scrap the Bullet, I could try the Valteks, they are indestructible ;D

You'll also fit the suspension to the superior Elite as well,presumably?
Title: Re: Fault Code P0420 Catalyst Low Bank 1
Post by: TheBoy on 15 October 2014, 21:17:25
Though if I scrap the Bullet, I could try the Valteks, they are indestructible ;D

You'll also fit the suspension to the superior Elite as well,presumably?
Probably not
Title: Re: Fault Code P0420 Catalyst Low Bank 1
Post by: chrisgixer on 15 October 2014, 21:18:55
I think you should. Just to rule out any oddities.
Title: Re: Fault Code P0420 Catalyst Low Bank 1
Post by: TheBoy on 15 October 2014, 21:22:41
I think you should. Just to rule out any oddities.
She's reasonably happy with it now, and I don't get to drive it much.

That said, that may all change due to the LPG situation around here  >:(