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[pauls]

I have just got the above code cat bank 2 . What does this mean and how do i fix

[aaronjb]

The best way to fix it is to have the post-CAT oxygen sensors moved to behind the main CATs rather than in front of them by someone who can weld on new bosses.

Don't have the CATs replaced by a garage, whatever you do.

[Entwood]

Its not a matter of "if" you get this code .. its "when" ....

Several things can help ...

Decent, branded fuel .. a couple of tankfuls of the "best" from Shell /BP seems to help, especially if you use supermarket stuff mostly

Drive it hard, give it a good belting with the decent fuel in, get the system really heated up .. seems to have a cleansing effect on the cats and stops the problem ( I tow a lot and that works the system hard .. so I don't seem to suffer as much as some)

I have a theory that the sensors detect a "change" rather than a specific value, a I get the fault regularly when I go to France and the fuel composition changes, I also get the fault when I return, it then stays away for a year ... until the next french visit.

A standalone code reader resetter, like the one in my sig, will enable you to reset the light in about 30 seconds ! which is what I do.

The effort of moving the sensors seems a tad OTT to me, but each to their own ..

One thing is certain .. it is not actually a major fault .. but the light on could hide another more serious problem ... which is why I turn it off ASAP

[pauls]

No light on just felt a bit iffy this morning so did the pedal trick

[twiglet]

No light on just felt a bit iffy this morning so did the pedal trick

In that case, it's a stored code, so the light would have come on at some point.  You can be pretty sure that it will come on again at some point.

I had this problem shortly after getting my 3.2.  I moved the sensors following the guide...

http://www.omegaowners.com/forum/index.php?topic=90613.0

This was 2 years ago, and I've had a light-free dash ever since. 

[biggriffin]

There are some who have fitted 3.0L Downpipes and had bosses welded in for the pre -cat lamdas.
. There was a thread or how to I think,as well as a how to move the pre-cat lamdas as entwood said.

[twiglet]

There are some who have fitted 3.0L Downpipes and had bosses welded in for the pre -cat lamdas.
. There was a thread or how to I think,as well as a how to move the pre-cat lamdas as entwood said.

see my post above. 

[Marks DTM Calib]

The only sensible fix is to move the lambdas to post the pre cat.

The post cat lambdas monitor for oxygen in the system, nothing more and there is pretty much nothing clever behind them. Any improvements or change in behaviour will purely be down to a change in the cat operation/condition.

Not to hard a job to do either with a good quality 25mm hole saw and a welder.

[pauls]

Just a couple of question..why now when nothing has changed always use esso/bp .which id bank 2.

[feeutfo]

The pre cats just loose efficiency, that's all. As said, every 3.2 will get this code, pre cats get a very hard life, with 3.2 litres of capacity blasting red hot exhaust at them.

It's really not a big problem. But having the light on would annoy me, I must say.

[albitz]

Its a 2.6

[Marks DTM Calib]

Same issue, same setup, just takes a bit longer to happen. 

[albitz]

Cheers, I wasnt sure tbh. Remembered plenty of reports from 3.2,s but wasnt sure about 2.6.

[Marks DTM Calib]

Cheers, I wasnt sure tbh. Remembered plenty of reports from 3.2,s but wasnt sure about 2.6.

Mick Dundee's 2.6 had this issue. 

[albitz]

Makes sense I suppose.Exactly the same system,but then again we are talking about Omegas,where things often dont make sense at all (at least to most of us)