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Hi, I had exactly the same problem as you all have reported. I ordered a Brake servo pressure sensor from the Audi Parts Department at my local Audi dealership. It was really really easy to replace like for like. I have no experience with car maintenance. I’ve got the A4 and it was to the top left of the engine compartment, under a plastic covering that lifted up. I’d recommend having a go. It cost me £75 for the part.

Hi Gareth, thanks for the tip. Let you how i get on mate. If the battery does need changing? I will pay towards it for a decent one. Thanks Irfan