I had taken my wife's Mercedes suv to another mechanic recently because her check engine light came on right before she was going to take it to get a smoke check. At the first shop they ran the diagnostics to check the code and found that it had something to do with the mass air flow sensor malfunctioning. They said instead of replacing the maf sensor that I should opt for the 65k miles tune up which includes an engine flush that would clear the problem and would be less expensive than the maf sensor. This sounded good to me so I agreed, a few days after spending $250 for the tune up the check engine light came back on. I brought it back and they said they found a loose wire that is most likely the problem, they proceeded to replace/repair the wire (another $100). The very same evening the check engine light came on again. Needless to say at this point I was very disappointed and frustrated. The owner of the shop finally inspected the vehicle and deemed that the maf sensor needs to be replaced and the sensor including labor would cost an additional $350. I promptly told him "no thank you." I than remembered that James (the owner of Sin City Garage) who had serviced my other Mercedes when he worked at the local Mercedes dealership had opened his own shop. I brought the suv to his shop and he ran a diagnostic and confirmed it was the maf sensor. He also mentioned that my wife's suv did not need the 65k miles tune-up that it would need one to at least 100k miles. I gave him the go ahead to replace the maf sensor, which ended up costing less than the 65k mile tune-up and to this day the check engine light has not re-appeared. I have since referred all of my friends to him. I am so glad that I have finally found an "honest mechanic" (not an oxymoron) in this town!