I asked Midas to repair my 99 Toyota camery in the morning on Aug 10. They called in the afternoon. They stated that it would cost me $950 to replace crankshaft sensor and mass air flow sensor, plus $101 for the diagnosis.
I checked manual of my car, this model does not have mass air flow sensor at all. So I called them, and asked them to stop there, and release it to me. I went to the store, and inspected my car again. I noticed there's plastic debris, and some engine compartment was open. Because I inspected my car before I sent it to Midas, I did not see plastic debris at all, and everything in engine was securely connected. So I asked the store manager to explain it. He could not give much reason, and agreed to refund the diagnosis fee. I asked them to explain where the plastic debris came from, and recover my car to its previous state. He refused to do so.