One problem related to carrier/rack has been reported for the 2011 Mazda MAZDA3. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2011 Mazda MAZDA3 based on all problems reported for the 2011 MAZDA3.
We were riding down the road and all of a sudden it sounded like a machine gun was going threw my speakers and the radio control would not control the load ness of it. We had to ride over 3 miles to the exit and get out when I turned the car off it stopped. Then it would make a awful crackling noise when the key wasn't even in the ignition. That went on for a couple of weeks now the radio doesn't work at all and it still crackles from time to time. I looked online and apparently a lot of people have been having the same issue and they said that the bose amplifier is going out making that noise. I've contacted bose waiting for a response. I'm just glad I wasn't in the car alone when it happened because we were on the interstate and it scared the crap out of us!.