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Magnet thanks for the suggestions. my sensible car has always been a Toyota RAV4 and the Audi my “Fun” car. The Toyota garage is a small independent and as I’ve been going there for 30 years and bought new from them they have agreed to look at my car to see if they can identify where the water is coming from. I will update this thread with any solution I find in case it is of use to anybody.

A dying battery sees a higher charge than a new one . If the BMS isn't reset ,the car will still charge the new one at the same rate . Thus shortening it's life. Loads of OBD2 scanners out there than can reset the BMS . Icarsoft, Topdon , autel . To name a few. A donor power source until the change over is complete, would be beneficial.

Suspension and water leak won’t be linked, it will be coincidental. Does car have sunroof, if so check drain channels at the front. They exit above the door hinge. More likely is blocked plenum channels behind the bulkhead. The is where the wiper motor sits. There’s rubber grommets that are badly designed for a northern hemisphere climate, that eventually block. Decent torch, remove plastic windshield cowl to see.

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

Yes, it's true the battery/car will need coding, however it isn't only VCDS that can do the job. Others can as well, though I don't know specifically which ones.

Have a search of the forum, and the answer will be found there - many times over.

Hello Mark, Possible reason why only 11.13volts at lock - ? High contact resistance - possibly due to cable fracture within flexible harness section twixt body and tailgate. This is always my first place to inspect for any such issues, before renewing anything. Issues usually manifest themselves during cold weather, when cables become less flexible. Regards, Gareth.

Thanks Magnet . More info as you suggested. Have owned car since 2017. It's in reasonable condition bodywise , has full leather seats and factory sunroof. Head lining needs replacing but otherwise interior good .Front end accident damage in 2021 - bonnet radiator and headlights replaced .Good deal of work done on engine in 2022 with rocker gaskets and oil seals replaced , new timing belt ,water pump and coolant hoses . Has now got fresh oil leak and plastic heater core tail has broken up. Needs someone with a workshop and the necessary skills to fix it. Believe not many examples left , so hoping someone is interested in preserving it rather than it being broken and / or scrapped. Love this car ,so it's not about money , it's about finding the old girl a new home .

Thanks again. I will approach my local independent and see what he says: if there is a fault then Audi can sort under warranty, if there isn't then I will save the cost of asking them to check. I suspect I am the wrong generation to start messing with the computers than run cars these days. i appreciate your advice, and if I get an answer, I will let you know what it is.

Welcome Harry, Well we have had some brief posts to date, but I’d put money on it that yours won’t be beaten at anytime! Just walk back to the previous bus stop, have a sit down and compile some suitable words which describe what you have, what it is like and want your goal is. Photos would be good/essential.

Thanks for the information Josh. That's the level of detail often missing from simple guides.