Mazda Mazda3 IV (BP) (2019 – 2025)

Reliability score : 8.8/10

The fourth-generation Mazda3 (internal code BP) marks an assertive move upmarket for the Hiroshima-based manufacturer. Launched in 2019, it stands out with its very pure 'Kodo' design, an interior finish worthy of premium segments, and drastically improved sound insulation compared to the previous generation. Technically, it abandons the multi-link rear suspension for a torsion beam, a controversial but masterfully developed choice that preserves the brand's excellent dynamism. This generation also introduces the revolutionary Skyactiv-X engine (spark-controlled compression ignition) and generalizes mild hybridization (MHEV) across its gasoline engines in Europe. A slight technical revision (e-Skyactiv X update) occurred in 2021, followed by a technological update (infotainment) in 2024. O

✅ Strengths

Exceptional overall reliability of gasoline engines (Skyactiv-G)
Interior finish and material quality worthy of the premium segment
Very high level of sound insulation
Driving pleasure and precision of the manual gearbox
Distinctive and elegant exterior design

⚠️ Weaknesses

Very fragile paint (especially Soul Red Crystal, prone to chips)
Poor rear visibility (especially on the 5-door / Hatchback version)
Rear passenger space and trunk volume are inferior to competitors
Maintenance cost of the Skyactiv-X engine (spark plugs)
Some parasitic noises (B-pillar, dashboard) on early model years

🎯 Verdict

The fourth-generation Mazda3 is an extremely relevant used (or new) choice for anyone looking for a reliable, elegant, and rewarding compact car to drive. The classic gasoline engines (Skyactiv-G 122/150 hp or 2.5L) are models of robustness and represent the safest choice. The Skyactiv-X engine is an engineering feat offering an excellent performance/consumption compromise, but it requires meticulous follow-up within the official network. Avoid 2019 models if you fear minor early defects (electronics, parasitic noises) and prioritize a model from 2021 onwards. The diesel should be avoided unless for exclusively highway use.

Common issues

Problèmes du système d'infodivertissement (gel, redémarrage, connectivité) Low

🔧 Dès l'achat – 80 000 km

💶 0 € (mise à jour logicielle) – 1 500 € (remplacement module hors garantie)

Vérifier les mises à jour logicielles et la couverture de la garantie.

Fissures ou éclats de pare-brise (sensibilité accrue) Medium

🔧 Variable, souvent après 20 000 km

💶 400 – 800 €

Vérifier l'assurance bris de glace. Conduire prudemment sur routes gravillonnées.

Bruits de freins (sifflements ou grincements) Low

🔧 20 000 – 60 000 km

💶 100 – 300 € (nettoyage/lubrification) à 600 € (remplacement plaquettes/disques)

Faire vérifier et nettoyer les freins lors des entretiens réguliers.

Décharge prématurée de la batterie 12V Medium

🔧 30 000 – 80 000 km ou après 2-3 ans

💶 150 – 350 € (remplacement batterie) à 600 € (diagnostic + remplacement)

Faire tester la batterie et le circuit de charge lors des révisions.

Estimated maintenance costs

Oil change	£70 – 130
Timing chain	£900 – 2 000 (si remplacement nécessaire, non un entretien régulier)
Clutch	£750 – 1 400
Complete brakes	£300 – 600
Estimated annual budget	£500 – 950

Indicative estimates (independent garage, UK market). Prices vary by region and year.