Mazda 3
2.0-litre SkyActiv-G with 13:1 compression ratio and chain drive. Core engine of the SkyActiv fleet with a wide power range from 88 to 121 kW.
Skyactiv-G 120 — the ideal all-rounder
The 2.0-litre Skyactiv with 120 hp is the balanced choice in the 3 BM — lively, economical and pleasant to shift. In corners the 3 BM rewards with precise steering and a sporty chassis. The lateral forces build up progressively through a well-calibrated steering rack.
Engine Weaknesses 6
Direct-injection carbon build-up on intake valves from crankcase breather oil mist. Typically occurs between 100,000–160,000 km. Walnut blasting is the only lasting solution.
Symptoms: Rough cold start with misfire codes P0300–P0304, sluggish throttle response, increased fuel consumption
Particularly on early build years 2012–2014, contamination in the oil pump pressure relief valve can reduce oil pressure. Persistently low oil pressure accelerates bearing wear considerably.
Symptoms: Oil pressure warning light illuminates, knocking noises from the engine, increased engine noise at low revs
A manufacturing deviation in the electric coolant control valve allows coolant to enter the dry chamber. The valve opens too early. TSI R054-21 affects all SkyActiv-G engines.
Symptoms: Extended warm-up phase, blue coolant warning light, poor heater output at idle
The oil control valve on the variable valve timing system is prone to seal leakage. Oil enters the intake system and increases carbon deposits. Can amplify misfires.
Symptoms: Oil film visible around the OCV housing, increased oil consumption, misfire codes from oil contamination
The PE-VPS develops tapping or ticking noises from around 30,000 km due to faulty hydraulic valve lifters. Mazda released revised HLA versions from spring 2022. Warranty replacement is possible on newer vehicles.
Symptoms: Deep, slow ticking at operating temperature, particularly at low revs. Noise disappears when the oil pressure sensor is disconnected.
As a direct-injection engine the PE-VPS does not clean its intake valves with fuel. From around 80,000 km without BeDi treatment, carbon deposits become so severe that only walnut blasting helps. A measurable power loss of around 10 hp is typical.
Symptoms: Gradual power loss, increased fuel consumption, rough idle behaviour. No sudden symptoms — deterioration occurs over months.
Vehicle Weaknesses 6
The MZD Connect system crashes, shows a black screen or fails to recognise navigation and USB devices. Problems occur particularly in cold temperatures. The cause is often the SD card or faulty firmware.
Suspension springs develop squeaking from 100,000 km, especially at low speed over bumps. Shock absorbers are flagged at later MOT inspections. The firm suspension shows wear earlier.
According to ADAC statistics, battery failure is the most common breakdown cause on the Mazda 3 BM. Especially on vehicles with frequent short trips or start-stop systems, the battery is due for replacement after 4–5 years.
Front brake discs and pads need renewing more frequently than on comparable vehicles. Discs can be below minimum thickness from as early as 50,000–60,000 km.
Early BM models exhibit a notchy shift feel, especially in the morning with a cold gearbox. Engaging gears requires noticeably more effort. The problem diminishes once the gearbox warms up.
Seats develop creaking and squeaking from around 50,000 km, especially the driver's seat. The cause is friction points in the seat frame. The problem is well known and often can only be fixed by removing the seat.