Common Problems with the
2016 Mazda 3 (BM/BN)

Short-trip town use causes frequent interrupted DPF regenerations on the 2.2 diesel, allowing diesel to dilute the engine oil. This can accelerate timing-chain, turbo and bottom-end wear. The problem is severe enough to warrant regular oil-level checks between services.

The front brake discs on BM/BN Mazda3s are prone to developing run-out and thickness variation, causing a judder through the steering wheel and brake pedal during braking. This is more common on cars used heavily in town with frequent low-speed stops.

The touchscreen registers inputs that aren't happening, often while the car is stationary or in slow traffic.

The plastic gears in the mirror motor strip, causing the mirrors to get stuck or make a clicking noise.

The Mazda3 BM/BN is known for draining its 12V battery faster than expected, particularly on models with the i-stop (start-stop) system. Owners frequently report needing replacement batteries after just two to three years.