Help Motor account lights up after starting permanently

Hello dear Omega-community, I have the following problem, for some time now the motor accounts light up with me. Since today it is so that the engine control lights up permanently at each start. I tried to read out a error code (instruction from another thread here in the forum), unfortunately it did not work or it was not saved, because the lamp did not flash but only illuminated. In a overtaking attempt today (kickdown) I had power loss and the car jerked like crazy, as if it can no longer switch on = very dangerous the thing. Have had in two weeks 1000 Euro repair costs with the cars already, slowly I lose the confidence in this car! What can that be? Drive an Omega B 2l 16V automatic year 1998 with 150 tkm. lg. Shany