Mercedes Classe B W246 (2011 – 2018)

Reliability score : 8.2/10

The Mercedes-Benz B-Class (W246) marks a major break from the previous generation (W245). Gone is the 'sandwich' floor: the W246 adopts the MFA (Modular Front Architecture) platform, shared with the A-Class (W176). This change lowers the center of gravity, drastically improves road handling, and modernizes the interior. Positioned as a premium compact MPV, it targets families looking for the three-pointed star badge with generous interior space. A facelift occurred in late 2014, bringing aesthetic touches (LED headlights), a modernized infotainment screen, and an update to the designations ('CDI' became 'd'). Overall, the W246 is a very accomplished vehicle and significantly more reliable than its predecessor.

✅ Strengths

Excellent interior space and trunk volume (488 to 1547 liters) for its size
Significantly improved finish quality and interior presentation compared to the W245
Very satisfactory overall reliability, particularly for gasoline engines and the small OM607 diesel
Safe and dynamic road handling
Standard active safety equipment (Collision Prevention Assist)

⚠️ Weaknesses

Suspension comfort a bit firm, especially with the AMG package or 18-inch wheels
7G-DCT dual-clutch gearbox sometimes hesitant or causing jerks at low speeds
Sound insulation of OM651 (2.1L) diesel engines could be improved under acceleration
High maintenance cost within the Mercedes-Benz network for a family vehicle
Average rear visibility (reversing camera highly recommended)

🎯 Verdict

The Mercedes B-Class W246 is an excellent choice for families looking for a compact, spacious, and well-finished vehicle. Contrary to the sometimes capricious reputation of MPVs, the W246 boasts a very solid reliability record. For Diesel: The most rational choice is the B 180 d (OM607). Although it originates from Renault, it has been perfectly made reliable, and its maintenance cost (outside the MB network) is reasonable. High-mileage drivers will prefer the B 200 d or B 220 d (OM651) for their highway cruising ability, but will need to be vigilant about timing chain and automatic gearbox maintenance. For Gasoline: The B 180 and B 200 versions are excellent compromises, very reliable and adapted to current anti-pollution standards (LEZ). Buy with confidence with an up-to-date service history.

Common issues

Encrassement du FAP (Filtre à Particules Diesel) Medium

🔧 100 000 – 200 000 km

💶 1 000 – 2 500 € (remplacement)

Privilégier les longs trajets réguliers pour éviter l'encrassement.

Dysfonctionnement de la vanne EGR (Exhaust Gas Recirculation) Medium

🔧 80 000 – 150 000 km

💶 400 – 800 € (remplacement)

Une conduite souple et des décrassages réguliers peuvent prolonger sa durée de vie.

Problèmes de capteurs NOx ou du système AdBlue High

🔧 100 000 – 180 000 km

💶 300 – 1 500 € (selon le composant)

Utiliser uniquement de l'AdBlue de qualité et éviter de rouler réservoir vide.

Usure ou défaillance des injecteurs de carburant High

🔧 150 000 – 250 000 km

💶 300 – 600 € par injecteur

Utiliser un carburant de qualité et un additif nettoyant préventif.

Dysfonctionnement de la boîte automatique 7G-DCT (mécatronique) High

🔧 100 000 – 180 000 km

💶 1 500 – 3 000 €

Vérifier l'historique d'entretien de la boîte, vidange régulière essentielle.

Estimated maintenance costs

Oil change	£100 – 180
Timing chain	£1,300 – 2,200
Complete brakes	£350 – 700
Estimated annual budget	£700 – 1,300

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