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Hi, done some digging and come up with the fact that the only true sealed unit gearboxes were fitted to A4 models pre 09 this was dropped after 09 as it was not very popular with the motorist, Audi are now saying that all the units are FILLED for life which is rubbish most of them have one filter cartridge on the box that needs changing except in the case of the ZF version which has an internal filter as well which will involve the sump being removed, the box also uses two types of oil ATF for the auto part and standard gear oil for the bit with the cogs in it. Steve.

The point about old batteries is not so much their remaining capacity in terms of ampere-hours; it is more to do with internal faults that can interfere with the car's ECU. I am no electrician so I can not explain it in any more detail, but I am aware that batteries can suffer internal short circuits, sulphating of the electrodes in lead/acid cells, sediment at the bottom, and other faults that are not apparent to the ordinary user without special test equipment. Can you get the battery tested by an auto electrician? When I last had a new battery fitted as a result of similar false warning lights, loss of turbo, and loss of cruise control, I was told it had to be "coded" to the car. Being a natural cynic, that phrase instantly made me suspicious that I was being told BS. Even though the new battery cured all the problems with the car I still don't know whether to believe this coding story.

Hi Ann, if its the cam belt I would get it done ASAP as if that goes its game over, anything else please feel free to ask as thats what forums are for, as for another car, whatever else you get will be the same through experience I have found other makes just go wrong more frequently at least with the Audi you fix it and it gives you a lot more problem free motoring even as a cab I have racked up 60k in mine so far with very few problems as you cant count cam belts as a problem as with clutches as they are a wear related consumable. Steve 🤔

None of us doubt how easy it is to change that switch. The important question is whether you simply struck lucky in choosing that option from the many possible causes of an ESP warning, or did you know it to be a particular weak point of the A3?