One problem related to engine shut off without warning has been reported for the 2003 Mazda MPV. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2003 Mazda MPV based on all problems reported for the 2003 MPV.
While driving vehicle on highway at 60mph in traffic vehicle shut off. Mazda mechanic told me coil on number one cylinder was bad. This had been replaced just a year or so ago but apparently was bad again.