I replaced the AIR MASS SENSOR and the EGR VALVE , pieand Gasket and then went to Autozone for scanning. The Check Eng light is still on, the car still won't pass the 2nd Gear and I also have a P0700 (Trans Control Sys Malfunction) code on. My biggest problem is the shifting Gear problem, what should I do about it. Also, is there a way to get ride of the check engine light without having to send the car to a Mercedes store?