The most commonly reported problem with the 2007 Mazda CX-7 has to do with the engine, according to CarComplaints.com. As of July 2015, 27 users reported engine issues, with the next most common issue being air conditioning and heater problems, reported by four users.
Of the 27 reported engine issues, 12 of them involve the engine timing chain becoming stretched. The typical repair cost for this issue, according to the users on CarComplaints.com, is $3,148. The issue occurred at an average mileage of 72,143. Other engine issues seen by four users each involved losing all power while driving and the turbo going out.