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If you do t use it then you could just leave it. With my A6 I've always chosen to carry out the repair. But I fully understand if you don't when you don't use the function.

Hi they say to maintain optimum results use about three times a year and with regards to the other additives I have used them on my last three cabs racking up some 750,000 miles and never had to have a DPF van when the last one got to the near solid volume because the wonderful fifth injector had packed up a new injector and a forced regeneration sorted that out, my other cab before that got plugged in at 270k by my neighbour so he could check out the latest Bosch software his boss had got him, he remarked that it was all pretty good for the miles especially as I must have had a new DPF recently, WRONG it was the same one it was built with, he looked shocked and explained the car was only showing 2% soot loading and 4% ash, I would definitely give the Archoil a go. Steve.

You're most welcome 🙂 glad you got sorted. It's nice when the forum has helped members 🙂

Ok, so an update.... I called the local Audi dealer and checked if they had the part in stock and they had 1 left (part number ending in B) which I reserved. It cost me £84.42. I got there and spoke to the parts guy and asked if they had many people come in for this part and he said yes and one person came in yesterday with a similar problem. To told him it's naughty from Audi as they/car dashboard are giving misleading information and he agreed. Anyway I got home and replaced the part - it's so easy that nobody should ever need to pay anyone else to change it. It took me 2 minutes (if that)! Shame on any garage charging more than 5min labour! Anyway, I started the car and so far I haven't had the warning light come on, but then again I only reversed a few meters back and forward in my drive. I will have to take it for a longer drive later when the roads are clearer to confirm that it's sorted! Looking back, the fact that the start/stop function was intermittent for a while maybe was a sign that there was a fault/sensor was failing, before the actual dashboard gave a warning! I would highly recommend getting a obd scanner too (which I recently purchased a couple of months ago) and it really helps to narrow down the issue and search on the net for advice - that's how I found this forum! Many thanks to all those who have contributed to this and the other main thread!

Very good question, not sure what a full cycle would be to be honest.

You're welcome 🙂 In theory no, but if it were mine id try and get the up to date part and a genuine one at that. As is the age old saying "you get what you pay for".

eBay should be your best bet. Alternatively look for a more up to date version 🙂 usually the last letter will change.