Transit makes real problems when travelling home from vacation

Hello, and I was on vacation with my Ford Transit (No WoWa) and he has already started to cause problems. He didn’t want to start any more. I was able to fix the problem on site. Shortly before the trip home the batteries didn’t go on at all! I have two batteries in the engine room. I bought a cheap battery for the return trip that I don’t get any problems. So when I was on my way home, suddenly my transit didn’t really start to accelerate anymore. It was just cruel. I called Adac in between (there I was at the border of Italy/Switzerland) and the partners made an error reading with me, which is logically in Italian (translated it). Error list: Inlet air temperature sensor – irregular signal – too high exhaust gas recirculation system – exhaust gas signal irregular – exhaust gas signal insufficient fuel valve interruption – incorrect function rotors tellungssensor/controller Fuel quantity – wrong function Calibration Pump rotor – calibration incorrect coding Injection pump – signal speed pump irregular – resistance Calibration irregular Sensor valve Exhaust gas recirculation – irregular signal Monitoring the speed Fuel pump – faulty electrical circuit My guess is that one part is defective and all the errors have arisen. Can also tell me why the car is not neller how 60 km/h could drive. Already a big thank you in advance. LG