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[Proz]

I have one of these Scotsure Warrantys on the car which is due to expire on the 21st of the month ..... it says the cat is covered  .... how much would i be looking at to have this done at VX as the claim limit is £500 .

[Proz]

Just off the phone to Vx .... goes in tomorrow to find out whats causing it  

[ians]

That's about the same as mine. Goes away for a few days then it's back. Thing is, the pre-cat isn't required to meet MOT emissions so it seems stupid to invest in a new one, it's just a pain to put up with the darn light on.

Kevin

Mine too. Came on a couple of days after you reset it Kevin.
I'm toying with Albatross's solution ie moving the sensors.  BTW how is that holding up?

[Kevin Wood]

That's about the same as mine. Goes away for a few days then it's back. Thing is, the pre-cat isn't required to meet MOT emissions so it seems stupid to invest in a new one, it's just a pain to put up with the darn light on.

Kevin

Mine too. Came on a couple of days after you reset it Kevin.
I'm toying with Albatross's solution ie moving the sensors.  BTW how is that holding up?

Popped in to see Albatross at the weekend and the cat efficiency problem has gone to be replaced by a fuel trim issue. Not sure at the moment if it's related to relocation of the Lambda sensors or not.

Apparently on some engine management systems the post-cat lambda sensors do play a role in adjusting the fuel, contrary to our previous assumptions that they just had a monitoring role. I'm wondering if this has been upset by adding another cat in the loop.

OTOH, it could be an unrelated fault.  :-/

I wouldn't say it's a verified "fix" yet.

Kevin

[ians]

That's a pity.   Did he just have the mod done on one bank or both?  I wondered if the fuel trim issue had appeared on one or both banks..?

What did you make of his stainless exhaust? - I sense my need to address this is approaching rapidly

[Kevin Wood]

That's a pity.   Did he just have the mod done on one bank or both?  I wondered if the fuel trim issue had appeared on one or both banks..?

What did you make of his stainless exhaust? - I sense my need to address this is approaching rapidly

Both banks were behaving the same, and both had a repositioned Lambda.

I liked the exhaust. Doesn't look anything out of the ordinary, just 2 plain pipes exiting the rear, which suits me. Sounds a little louder than the OEM exhaust but in a nice burbly way not a Kwik-Fit raspy type of way so I think I could live with it. Looks beautifully made. I'm very tempted myself. MOT in december and mine won't make it that long.

Kevin

[Proz]

Well just back from Vx ... they are saying its the cat and price is £850....cheapest they can do would be £780      ....... but if a new one was allegedly fitted by a non Vx garage 6 months ago i assume i should be getting back in touch with them ? .... My 6 month warranty runs out on the 20th of this month and covers up to £500 in a single claim . But i also have mot insurance which states if i take it back to be tested at said garage when its due it should be covered as well up to £500 .... or are these warranties not worth the paper they are written on  

[Kevin Wood]

I would ask them if they did an MOT emissions test on it. If it fails an MOT emissions test it sounds like you have a claim. If you bought it with warranty after the cat was replaced then your claim is with the garage who sold it to you IMHO. They might want to chase up any warranty on the cat though.

If you do end up replacing it yourself:

If it doesn't fail an MOT test, don't bother and live with it. It's only the pre-cat.

If it does fail the MOT, a second hand genuine cat would probably be the best solution.

Kevin

[Marks DTM Calib]

The post cat snsors dont do anything for mixture control on this setup and is a proven fix (mainly in europe)

I plan to do the re-postioning on Mick Dundees car when it arrives for its extended stay

[Kevin Wood]

The post cat snsors dont do anything for mixture control on this setup and is a proven fix (mainly in europe)

I plan to do the re-postioning on Mick Dundees car when it arrives for its extended stay

It's good to know that's confirmed.

It didn't really add up because I have a data log that shows the front Lambdas still toggling away so that doesn't tally with an extra 24% long term fuel trim due to the post-cats. I guess Albatross' issue is unrelated.

Kevin

[Albatross]

The post cat snsors dont do anything for mixture control on this setup and is a proven fix (mainly in europe)

I plan to do the re-postioning on Mick Dundees car when it arrives for its extended stay

Please do not be too sure just yet. I am moving my sensors back to their original position this morning to establish root cause. I'll be clearing tthe codes and will be able to confirm whether my current 0170 & 0173 problem is then replaced by 0420 & 0430 again in the next few days.

If this is the case then what Kevin Wood has found out would appear to be true and I would take the Europeans "proof" with a pinch of salt if I were you.

it would be good if you do go ahead and reposition his sensors from my perspective becasue if he does get the same behavious then I am even more convinced that I am on the right track, if not then I need to look elsewhere. Please keep me posted.

I am building up quite a case of evidence on sorting this 0420 pre-cat isue and I WILL FIX IT, but the movement of the secondary O2 sensors has co-incided perfectly with no further 0420 codes and the start of the 0170 codes so I am not convinced just yet.

Watch this space for details:

http://www.omegaowners.com/forum/YaBB.pl?num=1219699194

[Proz]

Well thats the car been in today and got a shiney new cat curtousy of the warranty so i'll see if this problem code goes away or comes back  

[Marks DTM Calib]

The post cat snsors dont do anything for mixture control on this setup and is a proven fix (mainly in europe)

I plan to do the re-postioning on Mick Dundees car when it arrives for its extended stay

Please do not be too sure just yet. I am moving my sensors back to their original position this morning to establish root cause. I'll be clearing tthe codes and will be able to confirm whether my current 0170 & 0173 problem is then replaced by 0420 & 0430 again in the next few days.

If this is the case then what Kevin Wood has found out would appear to be true and I would take the Europeans "proof" with a pinch of salt if I were you.

it would be good if you do go ahead and reposition his sensors from my perspective becasue if he does get the same behavious then I am even more convinced that I am on the right track, if not then I need to look elsewhere. Please keep me posted.

I am building up quite a case of evidence on sorting this 0420 pre-cat isue and I WILL FIX IT, but the movement of the secondary O2 sensors has co-incided perfectly with no further 0420 codes and the start of the 0170 codes so I am not convinced just yet.

Watch this space for details:

http://www.omegaowners.com/forum/YaBB.pl?num=1219699194

I am basing none of my statement on your current install as you currently have two many unknowns (like non standard exhaust etc) in the equation.  

The statement is based on the findings of two contacts of mine one of which has modifed 2 cars in the Uk and a further contact who has done 12 in Germany.....all of these were succesful.

[Proz]

Ok so the shiney new cats been on for a fortnight or so and guess what ...... this code has come back today ..... where do i go from here , ....... yes i can reset it every now and then but its still very annoying ..... should i change the downstream lambda .... had a few small niggling problems with this car lately and she is starting to test my patience  

[Albatross]

I can confirm that the issues I was having after moving the O₂ sensors behind the main cat were unrelated (in fact I had a faulty MAF that was causing me a large long term fuel trim error: codes 0170 & 0173).

In answer to your question; moving the O₂ sensors back has done the trick and is a sustained solution. I can fully recommend it from direct experience.

I had mine done by adding additional bosses behind the main cat on the stainless cat-back system when it was made, but any friendly and capable garage could drill a hole in the side of your existing middle section and weld you a nut on of the appropriate thread as a new O₂ sensor boss.

Plugs for the old (existing) hole are fairly standard fare (even a short bolt that matched the aforementioned nut would do the job). I suspect if you gave long-life a call they'd send you one in the post for very little as I saw boxes of them lying around when I was there.

The O₂ sensor cable is plenty long enough to need no modification to reach to behind the main cat. It certainly is on my 3.2 and on the 2.6, so I reckon you'd be safe there.

It is actually a very low investment and simple fix.

Go for it; what have you got to lose?

At worst you put it back again by undoing the O₂ sensor and short bolt and swapping them back.