You say you installed both cam sensors, both O2 sensors and the intake air boot and you still have a fault for post cat fuel trim too lean, BMW does not use the post cat sensors for fuel trim at all, they are there to monitor cat efficiency. The scanner you have is for generic use and is not telling you what is wrong. So have some faith and get the phone book, find a local dealer or an independent, and call them, share what you have done and ask if there is something that can be done to get your issues resolved without spending $$$$ on boots or sensors or scanners that dont fix the problem. The possibility is that you may NEED what you are resisting.
Monday, October 20th, 2008 AT 12:53 AM