Hi guys I am new to the forum and hope someone can help. I was towing a car trailer with race car on and the ML lost all power along the flat wasn't so bad but up any hill wouldn't get to 50kmph. Unhooked the trailer and drove ok but still lacking power slightly. Codes are C1140, B1040, B1786. I was thinking air flow meter but no codes relating to that I think. any ideas ? I'm in Australia. Thanks