Worst 2007 Mazda MAZDA3 Problems #1: Transmission Stuck In 3rd Gear 2007 MAZDA3 Average Cost to Fix: $3,400 Average Mileage: 152,000 mi. Learn More #2: Engine Sputtering 2007 MAZDA3 Average May 30, 2022 · The Car Complaints website has listed the worst problem for the Mazda3 as clutch failure, due to .