One problem related to gas recirculation valve (egr valve) 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.
2003 Mpv's check engine light came on shortly after getting on the interstate. Van had a "stuttering" feel. Even though the van was 5 weeks out of warranty by time, not mileage (39901 miles) I took it to the dealership hoping for a goodwill fix. They said it was the egr valve. I have never seen an egr valve to out so early. Dealership did cover the part and charged me $180 in labor to replace the valve that was only a two bolt removal and extremely easy to get to. Mazda should have covered this fully. I was expecting this to be the famous coil problem.