Hi guys, Recently had some running problems with my a4 b6 cab, BFB engine code. I was getting 3 codes; running rich,running lean and high rpm at idle. With a bit of research it led me to the crankcase breather valve. I replaced this and a good job I did as the old one was shafted. Now I have replace it with a genuine part I have just got CEL 17545 and 17536 running rich and lean?! How!? It had a new maf around a month ago. Any help would be great, thanks.