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Thanks for your advice Gareth; will do.

Thanks Gareth. The reason I posted this question was because the reply from Tayna was very non-committal putting the onus onto myself to make the correct selection,,, Earlier I found a useful tool on the Varta website (my existing battery is Varta); it lets you search for the current equivalent of an older Varta model that I shall order from Tayna taking your advice not to buy the cheapest. Regards Johnno

Hi SFIRTH. I did in the end! As I mentioned in my previous post I was working with a private ex-Audi master tech / mobile mechanic, and he managed to find a company to take a look at it who ultimately fixed it. I believe it was Hazzy Days, would suggest giving them a try directly. https://www.hazzydayz.com/ Essentially, mine went back and forth a few times to repair blown amp chips two-three times, but the same reoccurring issue kept blowing them, hence concluded it wasn’t just the chips. Eventually it went back again and they had a senior engineer look at it, and while I can’t remember the exact reason, it sounded like that there was some unwanted contact with the top of the MMI metal case and the PCB which was causing the issue? Not sure exactly what they did, but my understanding was it wasn’t something they’d ever come across before, hence they took a note for future repairs. I am making an assumption that you have the exact same MMI unit as me, but even if not I’d recommend trying them anyway.

Hello Tyler, Many thanks for your comprehensive post. If this were mine, I would be trusting this to a small trusted local garage with a request to give it a full service including a new air filter. 118k is relatively low for a 18 year old car, but some reasonable expenditure is inevitable. Spending more than you need to on a good service for this age of car would not make sound economic sense - hence entrust it to a local garage who you can talk to, rather than receptionists at larger dealerships. Stick some Redex or similar in it, and treat it to some non-supermarket petrol, and give it a good run before retesting the emissions. Kind regards, Gareth.