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When you refill, you have to do it very carefully with the MMI. You will notice that it shows an initial reading then a new reading about 15 secs later. That's the one to go by. Just fill it when hot, and you'll be fine - but it's very sensitive. Hence I use the oil pump!!

Cheaper than I thought. Thanks for the info, and enjoy your cuppa next time you change your oil

And remember the oil in the filter will come out too!!

Hi all, firstly thanks to all for their contributions on this thread to help highlight and fix this very serious issue. Some background information. I am based in Ireland and in 2017 bought a new A5 coupe 190bhp 2.0 TDi from an Audi main dealer here - this car has always been serviced through this dealer. With regard to this brake servo restricted issue I have been more fortunate than others and their experiences. The warning message first appeared in September 2021 (though with no accompanying start / stop function warning). However, this fault message disappeared after a few days and had been intermittent over the following weeks leading me to believe there was a loose connection somewhere. In early December the warning appeared again along with the stop / start function warning. Not realising the significance of continuing to drive with these warnings thankfully I only did limited mileage (this not by design) and yesterday I finally "googled" the issue. It was only through this forum / thread did I realise the potential to cause damage to the ABS system with a possible repair bill of €4,000+. So as of yesterday evening I stopped driving the A5 and this morning I rang my local Audi dealer to order the brake pressure sensor hoping they would have a unit in stock. They did (cost = €107) and all I had to do was mention the part and the guy knew exactly the part number I required - so obviously a wide spread issue with Audi ! It took less than 5 minutes to change out the old sensor for the new and on starting the warnings were gone with standard brake foot pedal pressure restored. My advice is similar to others on this thread - don't ignore the warning and you can easily replace the sensor yourself without resorting to Audi garage for high labour and diagnostic review costs. Thanks again to all the contributors here ...........

Hi I see what you mean its all wired in on the electromechanical braking system, I am trying to get hold of my garage to get the number for the Audi moonlighting engineer they use but they are not open until Monday, I have a very strong interest in getting round this problem as my car is due for a master cylinder change and I don't want to get into the same situation, I am leaning more towards readaptation but feel it may be worth looking at the fuses, believe me as soon as I can get an honest informed opinion I will gladly pass you the information. Steve.

This place is amazing (North London) picks your car up and drops it back off (for free) likes to explain everything in detail and isn't talking bull like I know other garages do and have done to me. Patrick like to speak to all his customers face to face and very reassuring and great guy and goes out his way to do thing's for you, worked for Audi for years so you know you can trust him with your car, fully competent, 10/10 for customer service and the work that he's done. He's genuine and doesn't try to get money out of you, (he told me to research things on Google and forums and see if I can do bit's myself to save some money) http://www.automotivecomponentsspecialist.com/ 020 3532 1275