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Hi might well be with doing if the pressure slows down it may well be the valve, how many miles has the car done as around that year they are famous for burning oil where they used skinny oil control rings, problem is they let oil up but also down which pressurises the sump, fingers crossed its the aftermarket valve. Steve.

No idea on warranty, but I’d like to think so. If you’re spanner handy, these jobs are not difficult. Water reservoir normally accessed by removing road wheel, then inner wheel arch liner. Normally a series of Torx screws and a couple of 10mm hex nylon nuts. If the reservoir has a crack, replace. Pump usually attaches with 12v supply, with rubber pipes. It could be leaking at a pipe attachment. Main Audi dealer is £200 an hour, not including parts. This is bread and butter work for an independent garage you trust.

Quick update , after jumping through a few hoops etc , its come back as being sorted under my Audi used car warranty. Total for quote £395. Replacement water reservoir tank and motor. As to why it needed a diagnostic check for a leaking tank ? obviously didn't have to pay for the check if its covered on Warranty. Booked in this Thursday , happy motoring.