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[tillers]

Hi Can anyone help please. I have a 3.2 Elite 03 plate, and the Engine Management Light now stays on. Getting it checked out the fault says both Cats have gone. Looking at the voltage from the output sensors they vary quite a lot and I had the comment that it was if there were no cats in there.
It has passed the emissions test no problem and I have changed the Mass airflow Sensor. I have also been advised it could be the ECU. I find it hard to believe both cats would have gone at the same time. Anyone know of anything else it could be or is there anyother way of identifying where the fault could be.

[hotel21]

Best bet is a proper code reader and then post up the codes but:-

http://www.omegaowners.com/forum/index.php?topic=90581.0

will also work, if you have a read of the howtoo....   

[aaronjb]

My bet is P0430/0420 and the fix is to move the second O2 sensors to behind the main CATs rather than in front of them..

[tillers]

Thans for advice much appreciated.
How difficult is to move the sensors.

My bet is P0430/0420 and the fix is to move the second O2 sensors to behind the main CATs rather than in front of them..

[RobseyMV6]

Thans for advice much appreciated.
How difficult is to move the sensors.

My bet is P0430/0420 and the fix is to move the second O2 sensors to behind the main CATs rather than in front of them..

Done mine few weeks ago, no problem now 

[TheBoy]

And for the love of god, do NOT let any dingbat ever, ever, ever, EVER fit pattern cats. Ever.

Did I mention, never, ever fit pattern cats.

Oh, and never use pattern cats. Ever.

[martin42]

what about cam gaaskets 

[TheBoy]

what about cam gaaskets 

The day when you regret that is coming very soon....

[Entwood]

If you regularly use supermarket fuel, try changing to a "named" fuel like Shell for a while, and whilst you have a tankful of the "good" stuff give the old girl a bit of an italian tune up .... you might well find the fault appears to go away.....

My experiences with the 0420/0430 codes seems to show that they are detecting a decreasing "change" in the quality of the emissions, rather than any specific "mix" in the emissions, so running a higher quality fuel and getting the system working harder appears to be beneficial.

[hotel21]

Opening a side thread by the following comment but......z

I've always used vmax or whatever momentum/enhanced fuel in my 3.2 and the only time I got a code up was when on holiday in Devon/Cornwall a few years ago and had to use standard unleaded and the proper stuff was few and far between. Once back on Vpower it cleared within a short period of time.

Or shift the sensors........



But read the codes and post up what you got! 

[TheBoy]

Opening a side thread by the following comment but......z

I've always used vmax or whatever momentum/enhanced fuel in my 3.2 and the only time I got a code up was when on holiday in Devon/Cornwall a few years ago and had to use standard unleaded and the proper stuff was few and far between. Once back on Vpower it cleared within a short period of time.

Or shift the sensors........

Not that mine suffers the 0420/0430 codes yet, but guess fuel quality depends on what I ate the night before

[tillers]

Thanks for all the help.
Any advice on whats involved in moving the sensors ?


Regards
Tillers

[TheBoy]

Thanks for all the help.
Any advice on whats involved in moving the sensors ?


Regards
Tillers

Drilling and welding. Fairly simple stuff, although I'm not convinced my (non-existent) welding skills are quite up for it...  ...although I am getting better, after attacking a window mechanism with a welder

[TheBoy]

To clarify, drill a new hole for sensor, weld in a new boss to give sensor something to screw into.  Fit a plug in the old hole.  A pair of bosses/plugs should come to around £15

Hope that makes some sense?

[keithnic]

My garage quoted an hour's labour to move the sensors so not too bad.  Funnily enough after my eml light being on constantly for about four years, I put on a new exhaust recently and the light has gone out.  I'm expecting it to come back on again after a number of starts, but that was a month ago and the light is still off.  I bought some bosses and plugs off Ebay as I guess it will come on again at some point and I'll need to get the sensors moved.