Today I went to the shop of the BMW mechanic that had my X5 since last Wednesday. He again stated that he did not know what was wrong with my X5 but did give me a bill for $360. I mentioned the mass air flow sensor to him and he said that he thought about that and unplugged it. He said that it still wouldn't start. He said I should take it to the dealership. He said the $360 was for a drive motor for variable intake which he replaced. That obviously was not the problem. He said that it may need a new intake manifold. Am I liable to pay a mechanic if the vehicle isn't fixed? He never told me that I would have to pay for parts or labor if he couldn't fix it. I have to go to the dealership at this point.