Hi again everyone, the my car appears to be broken again.
Today when I went to fuel up I parked at the bowser and turned the car off, I then tried to turn it back on to double check how much fuel I wanted to put in but the car didn't start, the dash said EPS error and had the EPC, CEL, Handbrake and TCS/EPS lights on, the car also made a vibrating/buzzing noise behind the dash. I decided to fuel the car up anyways and when I got back the car started and was working well again but with a much lower fuel range estimation than usual.

The car managed to drive about 200m before it decided to turn off while accelerating, the engine silently cut out, the brakes became stiff and I lost power steering which made it quite difficult to pull off the road, this time the car displays brake fault on the dash screen when the car initially turned off while moving, as well as TCS, Stability, CEL, EPC, but after turning the car off on the side of the road calling for roadside assist and trying to turn it back on it only came back with CEL and EPC. Roadside assist scanned it and said that there were no codes at all, battery was good, alternator appeared to be good, no visible damage, car turned on by itself again soon after.

Recently as I had another issue with the gateway module (check my posts for extensive information) I have replaced the fuel pump relay and gateway module and had an auto electrician, mechanic and Volkswagen techs check the car and aside from the gateway module there was nothing else they could fault.

Any ideas would be helpful, would be happy to go further into detail if there is information that you'd like...

This car man :(.

You'll need another diagnostic check to see if any fault codes flag up. 

Could this be battery related? Or instrument cluster related? 

Pretty sure its not battery related, its the first thing everyone went to, battery is fully charged and jump packs never helped/worked. I'm going to take it into my local Volks Centre again when possible to see if they can scan better but from the roadside assist there were no stored or pending codes at all so I'm pretty stumped on it.

Is the key still getting hot? I was sceptical of the diagnosis you mentioned in

https://www.audiownersclub.com/forums/topic/30433-no-crank-no-start-2007-audi-a3/#comment-127051

I know you believe the battery is fine, but have you had it properly tested to prove it is so? I mean a deep discharge test on professional equipment, not a voltage reading on a multimeter.

Nice to see you again Cliff, apologies, I was asleep until now.
The key isn't getting hot anymore and all the other issues such as the accessories turning off and the OBD port not giving signal seems to be resolved and with the new symptoms such as the CEL which was never there any of the times it failed before and the buzzing behind the dash it makes me think its something else.

I might try replacing the battery in the car and see what happens, haven't had the chance to properly test it yet, might see if the mechanics can when they reopen.

Update, its a doozy to figure out, the lights are changing and buzzing is louder.
 

Edited January 24Jan 24 by Lokis_Back