I would not fuss with your O2 Sensors, O2 related faults generally are in the P01xx group. P05xx in idle speed and auxiliary inputes. Check the vent valve /pressure regulator valve 11 61 7 501 566, common for that to cause a P05xx fault, and it's not a huge investment if your going to start to throw parts at the problem.

Thanks The Cleaner. Can I clean it or not or do I have to change it?

ALX5