Pics please as that's just weird.
Several ways, cheapest I've done for clients was auxin with a BT receiver or the more expensive AMI with BT adapter.
If you don't need any track...
That sounds like a relay, loud one at that.
Just check it's not a setup, as it could be a routine they've done multiple times, I would verify this loan situation 1st as the fact they don't...
Under warranty still I assume, take it in.
Don't know the engine unless it's a bkd.
We'll turbo is the next step then.
Usually not available separately from Audi & be careful the brackets thickness isn't to much to allow flush fitment.
What is it you're trying to achieve, apart from schematics.
Assume old bumper brackets aren't available now?
eBay has them, but be warned it may require a bit of modding to make them flush as some brackets...
I'd ask why its falling 1st, as it's not an old car thus shouldn't droop at all tbh.
If you left the lights on & car not started whilst messing with coding, they will drain the battery quickly.
Module 55 needs recoding/basic...
Use Tayna, very very good service & cheap for good batteries.
Did you Google the codes as yet?
If one key opens 3 doors but not one, then a 2nd won't help anyway.
It's more than likely the wiring in the hinge or the lock itself, both common...
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