A8 bought BJ:11/95 Complete equipment, has problems

Hello

I bought myself a duck for weeks looking for an A8.

The A8 has complete S8 equipment.

But now I have problems without ending.

1.) When switching on xenon light I notice a flickering are the pears through ??? If I turn off the switch for a moment and then it goes on again but after a ride on hopper str. It's over again.

2.) Light flap noises from the front axle wechle cost coming to me??

3.) If the air-conditioning fan runs all the time as soon as I push the ignition key in, error memory says (G42) signal to small)

Where is he sitting??? Somebody got a part number of it.

4.) Airbag Does anything with ignition signal too small??

Could someone help me further:
I have a 4.2L motor V8