About the Author Mandy Concepcion has worked in the automotive field for over 25 years. He holds a Degree in Applied Electronics Engineering as well as an ASE Master & L1 certification. For the past 18 years he has been exclusively involved in the diagnosis of all the different electronic systems found in today's vehicles. It is here where he draws extensive practical knowledge from his experience and hopes to convey it in his books. Mandy also produces an automotive technology DVD-Video series, writes auto repair books, develops automotive software and designs OBD-2 scanners, scopes and other diagnostic equipment.