P229f before p2200aa

Hi. Engine management light come on and for some time I can clear the code by computer every couple miles sometimes every 600 miles. Car has high mileage but is servicing every 10,000 miles I try change Knox sensor because show me see picture. I change one and problem coming back again. I try few Knox sensors exactly same one what I have on my car by part number. I don't know what to do please please help me I don't know what is this and mechanics also. Car still drive very well I tried to clear the cold when coming back but yesterday I can't clear the code.



Mercedes w212 Bluetec 2.2d 2014 miles 16,7000.