The battery died while I was away on holiday and the car was stood at a friend's place, he tried to jumpstart it a couple of times, but, no luck, anyways, after putting in a new battery, the panel is showing the following warning lights: ABS, AIRBAG, the brake light is flashing all the time, the concert stereo system does not turn on .....

the car is 1999, A4, 1.6.

 

ABS will reset its self on driving/airbag needs to be reset with diagnostics/audio needs a code

 

Hey welcome to the forum. Next time please post specific questions in the correct forum.