Could someone please tell me where to source one of these please?

Then engine light has been on for a while now, and is starting to sound rough on idle with the air-con tripping off in traffic.

I've heard they're relatively easy to fit but the prices from Audi are silly, but i don't know where to get one from which will be a genuine part and not a cheap re-production.

Any advice would be m very much appreciated

oh, the code has been verified by Audi, i'm not just guessing the fault

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It is. I just fitted the same part tonight, to my 55 plate 140bhp Golf TDI (engine code BKD).

If your doing it yourself, you'll need some long extensions to get to the 3 bolts from underneath the car.

Cheers