Car Is Bricked
My Key fob has been dead for a while and has been starting with the proximity start for a while, I had some unrelated issues to resolve today (PCV, Brake Pads, misc maintenance) which I took to my friends place to work on this morning; except when I got there and turned the car off, it refused to turn back on.
We went and got a fresh battery for the fob, still nothing. Fob light is on, does not lock or unlock doors, ignition doesn’t turn on nor does the engine. Tested the main 12v battery, it’s good, jumping the car didn’t work, no manual key reset trick worked. I am totally stumped, my windows are stuck rolled down and the e brake is stuck on so getting it towed is going to be a hassle as well.
For extra context: This morning I got a coolant temp warning on the dash that flashed on and off about 3 times, which didn’t make sense from a cold start (sensor issue or glitch), which never happened before.
I am leaning towards a fault sensor potentially keeping the car in a fail safe mode, or my key fob somehow unpaired with my car which is why even with a fresh battery it can’t unlock or lock the doors.
Any advice would be helpful, having a professional shop take a look as soon as possible :/
Edit: 2021 S5 Sportback