I ran the test in the instrument cluster and got 109 after three pulls in third gear. My left bank isn't reading the air that is coming in. I called a Mercedes approved dealer (they are 2 hrs closer than BMW) and explained my symptoms. He said if the Check Engine Light isn't on then the ECU isn't reading the air flow on that bank and the ECU is probably bad. He said that the O2 sensros should also chime in and trigger an SES light even if the MAFS didn't. Both MAFS are new and so are the O2 sensors. This guy has me nervous. I have the car scheduled with United BMW in Gwinette, GA on Thursday. I was just wondering what to expect. If I have to have a new ECU so be it. I don't want to be blind sided by such a $bill.