Lamda Sensor

There's many potential codes related to that sensor. Since you didn't list the specific code, I can only share that diagnostic fault codes never say to replace parts or that they're bad. They only list the circuit or system that needs further diagnosis, or the unacceptable operating condition. The sensor referenced in a code is only the cause of that code about half of the time. You also have to look for wiring problems like corroded splices or connector terminals, stretched connector terminals, cut or bare wires, and things like that.

No professional should tell you a part is defective without properly diagnosing it as such unless it's a real common problem.

We don't have listings up that high. Do you know the exact description of it?

O2 Sensor Pumping Current Trim Bank 1 Sensor 1

All the rest is in German. I don't know what to make of this. Does it mean the oxygen sensor is detecting an unacceptable condition, possibly related to other sensors causing that unacceptable condition, or is the oxygen sensor NOT working properly, and that's what the computer detected?