hi i have a yellow light{engine} on my car display its an airflow fault the garage says,,, but not sure what ? they want another £65 to find out what it is,,, the car is a 2009 cooper diesel and is running perfect ,,how can i check if the air flow sensor is ok is there a test i can do before i buy anything ? or pay £65 to a garage to tell me ,,thanks ,,,rob
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