One problem related to o2 sensor has been reported for the 2001 Mazda MPV. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2001 Mazda MPV based on all problems reported for the 2001 MPV.
Check engine light on repeatedly( at least 15 times in the past 12 months with the same 4 or 5 codes) car jerks when idling. Replaced O2 sensors, manifold gaskets(2), spark plugs and wires, top engine clean, many times the light was just reset. It was under warranty the first time it went in but even though it is the same thing over and over it is not covered. Dealer said they didn't know what was wrong with it. I could leave it there and maybe they could find something. November, 2003 to December 2003 was at the dealers for "12" different times that the light came on. This November it has started all over again. Do not have the old parts.