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Hi if you look at the facts no one could offer the magic cheap diagnosis based on the information you have given, no codes, no map information, whatever problems you have they don't sound like the sort of engine problems that one would normally encounter, no one is acusing you of having a bad map downloaded but its difficult to quantify your problems without the milage and as I said any codes that might be present, from my perspective if I was buying a car like that and it had robust milage and had been remapped I would have walked away as the previous owner may not have been kind when driving it, the health check was six months ago thats a long time in the life of an engine and as Cliff pointed out are you using any water or oil, these are not random irrelevant questions but are based on experience gained by asking other users of this forum often with a favourable outcome, without any usable information the question you are asking is how long is a piece of string, I don't think anyone on here knows the answer to that. Steve.

I have a 2021 A3 and have had the MMI black screen on several occasions, and the garage only responds by resetting it - which they say can only be done by them. But…I have managed to reset it myself by holding down the small power button on circular dial that is in the centre console for a few seconds - it turns the MMI system on and off. It usually then reconnects and reinitialises the navigation system and the whole thing works again. Obviously different models may be different but it has worked for me. It’s still not 100% reliable but now for 95% of the time it is working! Worth a try if you have this set up in your vehicle - it also seems to update the MMI as part of the process.

Mark. Repeating word for word what you wrote earlier does not help. We can only work on the information you supply and so far that has been sparse, so I ask again about mileage, coolant loss, EGR and DPF. Additionally I don't see anything terribly unusual about your fuel consumption. Assuming diesel is £1.50 per litre, 150 miles on £30 worth of diesel equates to 150 miles on 20 litres, which equates to 150 miles on 4.4 gallons, which equates to 34.1 mpg. That's not too shabby depending on how the car is driven and how many miles it has done. I never accurately checked my own but I believe it to be 35-40 mpg.