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Can't answer specifically, but its usually to do with offset to clear caliper, spacers, etc. Check for an A3 brochure for your car and see what wheel options were availablefrom Audi. Again is it stock ride height in terms of springs.

It has nothing to with theft prevention, and everything to do with ensuring the battery is charged correctly to avoid damage.

Yes, never stated or implied that I wasn’t going to or that it wasn’t needed. However, wasn’t quite prepared for it to weigh 22kgs when I picked it up!

It's called charge cycling . The system tries it's best to always keep the electronics in tip top shape . You've got all the safety features ,like Audi sense , the srs system , abs, esp . The list goes on and on. My car is also mhev , so it's alot of electrics I dare say even Audi techs need help with . If you just swap a battery over and don't inform the cars brain , it'll be a massive shock to all the systems . Welcome to the new world. Say goodbye to points and condensers. Embrace technology. 😁😄😁

Why not buy a classic car where you can stick a key in a lock and open and close the doors without any remote, only have 2 warning lights to worry about, no MMI, and above all, if it breaks down you don’t need to plug it into anything? ‘Design philosophy’ !? I bet you wouldn’t do without your modern toys. Forgot:- if you want audio, hold the end of the aerial cable and sing!

Good evening Trevor, I did exactly the same, I believe the black box is a subwoofer. I’ve just bought a space saver wheel as ive read previous comments and they say that the goo doesn’t really work. Hope that helps Rods444

Hi , it should come with the large o ring . It’s the smaller one on the side that I purchased separately. I replaced this and it leaked so just use the old one and put some sealer round it ! I did it on a ramp from below . It’s a pig of a job ! Removing the manifold may be easier ! Good luck

No problem Dave, You asked whether the new battery needs coding, and you have been given the answer. Now you seem to want to question that advice and conclude that you ( in caps) have answered your own question, with an answer totally opposite to what you sought an answer to in the first place. Good luck when your alternator attempts to overcharge the new battery, kissing goodbye to any warranty you would have been given. You can then ponder over whether the alternator decides it had enough and gives problems.

Can you get a multimeter on the starter motor to see if it's getting power? Again, this time of year sorts the wheat from the chaff so to speak with weak or old batteries. Also use multimeter on new AGM battery to double check. I normally stick it on a trickle charger to top up before installing.

Hi all, I enjoy a bit of motorsport history and I came across this "documentary" on YouTube and I thought it would be appreciated here. It's a bit long, about 45min, so watch it when you have the time for it. I hope you enjoy it. https://youtu.be/gP4SvsFpyCc?si=f5DtjLRM5r0rekxv

Looks interesting thanks for sharing

The car is drivable after 12v battery change, however it’s advisable to code it.

Yeah I paid cash in hand for mine . Good mechanics have good word of mouth reviews.