Mazda Mazda6 I (GG/GY) (2002–2007) (2002 – 2007)

Reliability score : 6.8/10

The first-generation Mazda 6 (chassis codes GG for the sedan/hatchback and GY for the wagon) was launched in 2002, marking a turning point for the brand with its 'Zoom-Zoom' slogan. It positioned itself in the family car segment, offering a more dynamic and stylish alternative to established competitors. Available as a 4-door sedan, 5-door hatchback, and wagon, it appealed with its agile road handling, precise steering, and sporty design. A facelift was carried out in 2005, bringing minor aesthetic changes (bumpers, headlights, taillights), interior improvements (materials, instrumentation), and technical evolutions, particularly for the diesel engines. The Mazda 6 I is generally appreciated for its reliability in gasoline versions and its driving pleasure, although the diesel versions fac

✅ Strengths

Dynamic and agile road handling
Still current and sporty exterior design
Exemplary reliability of MZR gasoline engines
Good level of equipment for its time
Decent interior space and trunk volume (especially in wagon)
Precise and pleasant steering

⚠️ Weaknesses

Poor reliability of 2.0 MZR-CD diesel engines (injectors, turbo, DPF, flywheel)
Susceptibility to corrosion (wheel arches, sills, rear subframe)
Imperfect sound insulation at high speed
Quality of some interior plastics (pre-facelift)
Slightly large turning radius

🎯 Verdict

The first-generation Mazda 6 is a car that has aged well, offering an excellent compromise between dynamism and practicality. My verdict is clear: prioritize MZR gasoline engines. They are remarkably reliable, with a timing chain and few costly breakdowns. The 2.0 MZR is the most balanced choice for versatile use. Regarding the 2.0 MZR-CD diesels (RF5C and RF7J), caution is advised. Recurring problems with injectors, turbo, flywheel, and DPF (on the 143hp) can lead to expensive bills. If you are considering a diesel, ensure you have an impeccable service history, invoices proving the replacement of weak parts, and budget for potential repairs. A thorough test drive and inspection by a professional are essential. Regardless of the engine, corrosion is the weak point of this model. A meticulous inspection of the underbody and wheel arches is crucial. If the bodywork is sound and the engine is gasoline, the Mazda 6 I remains an excellent choice for its driving pleasure and value for money on the used market.

Common issues

Corrosion structurelle (châssis, longerons, passages de roues) High

🔧 Dès 80 000 km, s'aggravant avec l'âge et l'exposition au sel

💶 1 000 – 3 000 €

Inspecter méticuleusement le châssis et les points d'ancrage avant achat.

Défaillance du turbocompresseur (2.0 MZR-CD) High

🔧 120 000 – 180 000 km

💶 900 – 1 600 €

Vérifier l'historique d'entretien, vidanges régulières avec huile de qualité.

Encrassement ou défaillance de la vanne EGR Medium

🔧 80 000 – 150 000 km

💶 250 – 550 €

Une conduite variée (route/autoroute) et nettoyage préventif peuvent aider.

Problèmes d'injecteurs (2.0 MZR-CD) Medium

🔧 150 000 – 200 000 km

💶 400 – 800 € par injecteur

Utiliser du carburant de qualité et éviter de rouler sur la réserve.

Usure du volant moteur bi-masse (DMF) et de l'embrayage Medium

🔧 120 000 – 180 000 km

💶 1 200 – 2 000 €

Tester l'embrayage, écouter les bruits anormaux au ralenti et lors des changements de vitesse.

Estimated maintenance costs

Oil change	£70 – 130
Timing chain	£650 – 1 200 (si remplacement nécessaire)
Clutch	£750 – 1 500
Complete brakes	£280 – 580
Estimated annual budget	£650 – 1 300

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