Toyota Sienna IV (XL40) (2021 – 2025)
Reliability score : 9.2/10
The fourth-generation Toyota Sienna (XL40) marks a radical break in the model's history. Abandoning the traditional V6 engine, it adopts exclusively a hybrid powertrain (THS II system) based on the TNGA-K modular platform, shared with the RAV4, Highlander, and Camry. This bold technical choice allows it to achieve record efficiency for the minivan segment, with an average fuel consumption hovering around 6.5 L/100 km. Available in FWD or with an electric all-wheel drive (AWD-e) transmission, it stands out for its gigantic interior space, smooth operation, and exceptional overall reliability. Although primarily intended for the North American and Asian markets, it remains an absolute benchmark for large families seeking peace of mind.
✅ Strengths
- Unbeatable fuel consumption for a minivan of over 2 tons (around 6.5L/100km).
- Imperial reliability of the Toyota hybrid system (series-parallel) and the 2.5L TNGA engine.
- AWD-e all-wheel drive without a mechanical driveshaft (fewer moving parts).
- Gigantic interior space and modularity (available in 7 or 8 seats).
- Very well-designed and durable power sliding doors and tailgate.
⚠️ Weaknesses
- Combustion engine (4-cylinder) noisy during hard acceleration (rubber-band effect of the e-CVT transmission).
- Second-row seats are not removable (they fold but cannot be taken out to load very large objects).
- Not officially marketed in Europe (specific body parts requiring importation).
- Quality of some interior plastics lags behind the competition (Honda Odyssey).
🎯 Verdict
The 4th generation Toyota Sienna is undeniably the most rational and reliable minivan in its segment. Toyota's gamble to impose 100% hybridization is a total success: it offers the fuel consumption of a compact sedan in a vehicle capable of transporting 8 people and their luggage. Reliability is spot on, supported by the excellent reputation of the 2.5L TNGA-K powertrain (shared with the RAV4). If one accepts the inability to remove the second-row seats and the engine noise under hard acceleration, it is a highly recommended purchase, offering unparalleled peace of mind over the long term.
Common issues
Problèmes logiciels du système d'infodivertissement (bugs, lenteurs, déconnexions)
Low
🔧 Dès l'achat – 60 000 km
💶 0 – 300 € (souvent résolu par mise à jour logicielle ou réinitialisation; remplacement module coûteux hors garantie)
Vérifier les mises à jour logicielles et l'historique des interventions.
Défaillance prématurée de la batterie 12V
Medium
🔧 20 000 – 80 000 km
💶 150 – 350 € (remplacement batterie et main-d'œuvre)
Surveiller les démarrages difficiles; vérifier la tension de la batterie régulièrement.
Dysfonctionnement intermittent des capteurs d'aide à la conduite (ADAS)
Low
🔧 Dès l'achat – 70 000 km
💶 100 – 800 € (diagnostic, recalibration ou remplacement d'un capteur)
Tester les systèmes ADAS lors de l'essai routier; vérifier l'historique des diagnostics.
Estimated maintenance costs
| Oil change |
£70 – 130 |
| Complete brakes |
£220 – 480 |
| Estimated annual budget |
£450 – 900 |
Indicative estimates (independent garage, UK market). Prices vary by region and year.