One problem related to power train driveline has been reported for the 2003 Mazda MAZDA6. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2003 Mazda MAZDA6 based on all problems reported for the 2003 MAZDA6.
Cv joint boot failed and wore a hole in the brake line. Most of the ability to brake the vehicle was lost. There did not appear to be a split brake system.