Error with ABS/Traction Control/Lenkradsensor (lamp flashing)

Hello and help! Maybe someone can help me?! I have a Mitsubishi Sigma Bj. 91. In January the cuffs of the drive shafts (drive shaft pleat cover) were renewed at the front right and left as well as the two rear stabi bushings. Since the removal on both sides was apparently very difficult, according to the workshop “strongly hammered”. On the right side the thread of the drive shaft was sanded. After the repair the following errors occurred: 4 weeks later, the following errors occurred: The light of the traction control lights up after a few minutes of driving, flashes until the engine is switched off. Was then at the workshop, the following errors were read out: ABS: 32 wheel sensor at the front left and TCL (traction control): 34 steering wheel se nsor. The answer of the workshop was that the steering wheel sensor had to be changed (it could not be learned) and because of the ABS everything had to be expanded again to look (but at my expense). A few days later: the car can no longer be “up/down” (in the sigma you can adjust the altitude level, from 160 km/h it automatically lies lower etc.) and at the front right there are sounds (metallic “crack noise” when steering or if you are looking at The noise comes from the area of the fender at the front right and also occurs when you “swivel” the car by hand. All these problems occur since the repair, before I had no faults. I would be very happy if someone could give me tips. Thank you in advance and many greetings M205PS