Audi 80 Avant goes out with spare key

Hello, after I almost got used to the sound of the W124, now the Audi starts to spin. Just come home and my female tells me the following problem: The Audi can start with the spare key and then goes out again. My comment: don’t exist! Even tried out: in fact, the little one is right. Counter-probe with the original works as always. Maybe the key from the keymaker worked uncleanly and did not have a safe The only problem now is that suddenly the ABS light is burning! Can it be that the control unit was “confused” by the start-off? In the first two attempts it was still switched off. Or what else could it be? Greeting Jürgen *** Audi 80 Avant, Built 95 / 90 hp; 120000 km 230TE / W124, Built 90 / 132 hp; 218000 km