Error 243 after engine change

Hello guys, a week ago we changed the engine in our 850 MJ 95 (B5252S). So far so good. On Monday morning at 3 o’clock it was so far and the thickness jumped on. Due to the overtiredness when plugging together, I then checked everything again on Monday. The car jumped on worse. I read out the errors and got in response camshaft sensor (314) and throttle flap poti (243). The camshaft sensor I think that the rear NW about a tooth rot In any case, the sensor ran smoothly until it was extended. I will go on next week. But what is worse is the error 243. I have already changed the poti and get the same error after deleting it. Lambda light is on, gas system (KME) shuts off. The car runs on and on itself quite well. Only the consumption is extremely high with 16-17 liters (city). On the highway I am at 120km/h at 9.5 liters. In idle it swings a little and d My question to you: Can you help with the troubleshooting by experience and exclusion? How can I check the cable from the poti to the SG that there is no cable break or something. Ohso, throttle flap I cleaned before installation and the eye test mine that seems to be still OK. I’m not quite sure with the vacuum hoses. In the appendix some pictures to it. Hope you can help me n. Thank you very much Janko