One problem related to engine rattling and whining sounds has been reported for the 2010 Mazda MAZDA3. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2010 Mazda MAZDA3 based on all problems reported for the 2010 MAZDA3.
My car has had rattling noise coming from the front passenger side of the hood for a few months now and took it to a mechanic and they said it is common for this model to have a motor mount issue. . But not to fix it yet because it is just now starting and it will be fine for a 6 months or so?!?!? seriously . . .