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OK David -missed that last sentence. Possible coolant temperature sensor that senses the coolant temperature and signals the ECU to provide the correct mixture in relation to coolant temperature?? They can fail to an arbitrary condition where starting and running mixture is too weak.

Glad you got sorted 🙂

Hello Tom, Returning the car to the seller 5 months on??? 90 days is a typical warranty period. Your issues maybe (just maybe) associated with your statement ‘…done barely any miles on it…’. On the basis of eliminating simple low cost investigations, it would be well worth getting the battery efficiency checked - Halfords stores will do that. Spurious messages are often associated with below par battery efficiency, and your situation will be aggravated by periods of lack of use. Take the car for an approx. 30 mile run before getting Halfords to report on the battery’s efficiency. Please let us know how you get on Tom. Kind regards, Gareth. p.s. worth getting the alternator output checked at the same time.

Keep us posted on how you get on

The door issue could be an issue with the striker unit. Older audis suffered from this like the A6 C5. The seat movement could be an issue with the switch.

Looks great! Keep us posted on how you get on with other mods.

Has the door been removed or damaged? If so, it would be worth looking for some misalignment of the hinges or lock hasp. If that aspect is fine then I suspect the lock inside the door is defective.