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Many thanks everyone for your input. i know that Celtic have a very good reputation, but on balance, i think it may be best to leave well alone for now. it may also be that it will be fool’s errand as in all probability the ECU is locked 😢

Thank you chaps, and the same to you all. After watching the concert from the Musikverein Vienna, I'll take advantage of the sunshine and walk the lanes nearby. Cliff.

A little bit late - still running on choke after the Rioja - but we too wish everyone on here as trouble free a 2026 as possible, and a special thanks to all those who spend their time and expertise in helping others when they are in difficulties. Spread kindness where it’s deserved, and it will be returned three fold. Take care all. Kind regards, Gareth & family.

Thanks, Steve Q and Spartacus. I'll get a new battery and let you know how I get on with the outcome. As for the maf sensor issue, I'm pretty sure it's because I unplugged it the other day to see if it improved the choppy engine, though if it were injectors, it would have smoothed out. Will look into coding the new battery and let you know thanks for the help guys and Happy New Year 🎉🎉 Ps stay tuned I’m about to replace all front control arm bushes with new ones in the coming weeks hopefully without to many problems.

Too true!

Happy new year all @Steve Q not pleasant, but one hell of a critic 🤣

Wow, thanks for your very prompt and informative replies - much appreciated! Best regards, Chris

Got a new battery fitted, however the garage couldn't code it so need to go to an Audi specialist to get that done, but it is running with no faults.

Or fit the right sized tyres to keep things correct. 👍.

Well. Thought I'd narrowed it down a bit, just went to the supermarket first drive of the day, the noise happeened as I was reversing out just below full lock. The only time I've previously heard it has been in the same conditions, cold start in cold weather so I thought I'd try it again when I got home and it was even worse. Thought I'd record it to show Audi and of course I cou;dn't reproduce it. Will definitely speak to Audi tomorrow

Shouldn't be an issue as long as the rolling radius matches what came off , usually within 4% .

The dogs hate fireworks. Couldn't make it up lol 🤣 happy new year Kev.

Check battery as mentioned, especially with central convenience module faults, steering module, seats, etc. Also noticed the mass airflow sensor fault. Always fit genuine Audi part. Before you do anything, get a multimeter on battery, then 12.4v - 12.7v (not running). Noticed in the VCDS log: ‘Voltage terminal 30: 11.180 V’ It’s not running I know, but that’s low. Even when it’s running, I’d expect over 14v, but it’s was under and that was back in the summer according to coolant fan issue. I’d be included to clear all DTC faults and run again. As soon as any performance issues, scan car again. If battery is goosed, fit AGM version, best you can buy. Pretty sure it needs coded on 2011 plate. You have VCDS, so piece of cake.

No specific experience of Celtic Tuning. But I see they actually advertise DPF and EGR deletions, that tells me all I need to know. I've watched my fair share of modifications and if I was going to do it - I'd search our Darkside Developments. They seem very knowledgeable technically speaking. As with all performance upgrades - it's what can the gearbox handle? I know in your case whether 30 TDI (114bhp) or 35 TDI (147bhp) if mated with an S Tronic auto box, then just keep up maintenance regime or that's an expensive fix. You'll already know on 2024 build car you'll automatically invalidate what's left of manufacturer's warranty.