Hello! These are my problems:
Rough idle/bad throttle response. But the engine starts normal, cold and hot. The rough idle starts after warming up approx 5 minutes. I think idle in open loop is ok. Then the engine goes to closed loop. After approx 2 minutes the rough idle begins. Then the exhaust gets a poping sound, like very small explosions (I don't know a good english expression)
Now I used a scanning software and the only thing I noticed was that the engine is always changing between open and closed loop. Could this be normal?
The O2-sensors always have arround 0.5 V. I think this is ok, isn't it?
Last weekend I disconnected the O2 sensors but without any reaction to idling.This week I deinstalled the sensors and they are a little bit black, but I think this is normal, or not?
Perhaps I could send the data (From TTS Datamaster) to anyone who could handle these data better than me => You're welcome.

 

O2 sensors, once warmed up, should constantly be moving between .1 and .9 volts. Likely that the O2 sensors are your problem. If you have more that 60K miles on them, probably due to be replaced anyway. As O2 sensors age, they get coated and tend to make the car run rich as they can't sense the O2 levels are accurately due to the coating.