Golf 2.0 GTI Lambda probe signal to Mager Bank 1 probe 2

Hello dear community! I have a problem with our Golf 7 GTI. It comes the engine control light while driving. (yellow without warning tone) Reading out with the colleague resulted: “Lambdasonde 2 Bank 1 signal to Mager. Erase unfortunately brought nothing, because it occurred after a few KM again. Also we could find in the diagnosis misignition on cylinder 2 u. 3. The engine then ran in the stand restless. But the restless he has always felt and occurs sporadically and is only in the stand. I do not know if it has something to do with the message of the probe. Car was then brought into the workshop. (Stop and Go) In the workshop first the probe 2 was exchanged so after Kat. Unfortunately, this did not bring any improvement, lamp went back to after short time. Then the ignition candles were exchanged, also unfortunately no improvement. The workshop is with its Latin at the end and I say I should be pre-figured at VW because I could probably read even more values. Has someone vll. has an idea what it might be bad?