Emissions light.

Hi,Ive been having an issue with my emissions warning light displayed on my dash,
It was checked with Vagcom and the fault codes stated that both my Lambda sensors were faulty(2004 3.2. 31k on the clock)so i got them changed,two weeks later the light was back on and the garage said it was showing up as intermitent faults with the post cat sensors.
So had them changed and all was fine for 2 days and guess what? the light was back on!!
The garage said it was a problem with the wiring loom ie; water ingress causing the ECU to pick up the faults. So they hard wired the sensors to the loom and reset the ecu.
35 miles later it was back on
Has anyone heard of this problem before and if so whats the best cure as its cost me nearly £1000. and im sick of paying out money on something which surely is a manufacturing fault. Audi say they have never heard of this before(yeah right).
Any advice would be a blessing.
Cheers

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TT 3.2 V6

That's a strange problem. How old is your car? You can always not take it back until they can guaranteed it's fixed. Did your vendor not test it?

It's indeed important to fix because if you plan on selling your car later on and the emission light still shows up I guess nobody would buy it. You might also get some problems in some US states if it the light shows that your card produces too many emissions.

I found this across another forum, somebody had the same problem as well. Nobody was able to help:
Let us stay updated!

Ive got the car booked in again this Friday so hopefully they will sort it. Fingers crossed.

Yep. And make sure you don't take it back before they fix it. This is a serious issue.