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The refridgerant gas has probably leaked out from a hole or a worn pump seal. Get the system pressure tested for leaks, and repair as necessary, before having any remaining gas sucked out and replaced with the correct weight of refridgerant. I suggest using an aircon specialist rather than an Audi dealer.

Hi any warning light even if appears and disappears warrants investigation as the way the software works on Audis is it monitors faults and severity until they come up a maximum of ten times this then defeats the unlearning counter therefore it becomes a permanent code and possibly limp mode, now that you have announced its petrol I would definitely check the injectors but I do suspect if it smokes when accelerating hard it may be worn piston rings, get a compression test done to rule that out. Steve.

Nevertheless the car needs to be scanned on a decent code reader as Steve suggested. Warning lights on the dash are not enough to diagnose faults.

I believe Steve was referring to oil pressure not oil level, hence the possible need for a new oil pump.

Done.

I've now contacted the BBC Watchdog program to see if they will take an interest in this issue.