Toyota Sienna XL40 — Problems & Common Faults
Weaknesses, engine ratings and buying advice
The fourth Sienna is hybrid-only since 2021 — the A25A-FXS 2.5L at 180 kW system output powers all variants. No more V6, no conventional drivetrain. Toyota goes all-in on efficiency.
The A25A-FXS is one of the most mature hybrid powertrains on the market — real-world consumption over 33 mpg for a full-size van is impressive. The e-CVT is barely noticeable. The HV battery is designed to last the vehicle's lifetime.
Test-drive checklist: Hybrid system in pure EV mode. Real-world fuel economy over mixed driving. Sliding door operation. Third-row HVAC.
2026 market: Between $33,000 and $52,000. Holds value well due to the hybrid-only strategy.
Insider pick: Sienna XLE AWD — the sweet spot of features and value.
Generations
Engine Overview
The Toyota Sienna XL40 is available with one engine variant at 245 hp.
Fourth-generation hybrid four-cylinder with Dynamic Force technology, a high compression ratio and combined port/direct injection. Extremely economical for its size and, thanks to the hybrid system's electric assist, cultivated and lively off the line. Timing chain, no systematic weaknesses so far — regarded as the benchmark for hybrid reliability. Direct injection can build up intake-valve carbon long term, so good oil and a 15,000 km service make sense. When buying, check the condition and diagnostics of the high-voltage battery and watch for a clean cold-start phase.
- !! Hybrid Battery: Moisture and Heat Protection from 150,000 km
The hybrid battery in the RAV4 XA50 with A25A-FXS sits under the rear seat and can be damaged by moisture. Blocked ventilation slots lead to battery overheating.
Symptoms: Hybrid warning light, reduced battery output, 'Check Hybrid System' message, in severe cases complete battery failure - !! EGR System Clogged and EGR Cooler Leaking from 130,000 km
The EGR system on the A25A-FXS tends to clog with deposits from approximately 130,000 km. The EGR cooler develops cracks and allows coolant to enter the EGR circuit.
Symptoms: Power loss; foul smell while driving; low coolant level; fault messages on the instrument cluster - !! Electric Water Pump Leaking from 60,000 km
Toyota issued a TSB (T-TT-0614-20) for 2020 A25A-FXS engines: coolant leak at the housing or connector of the electric water pump.
Symptoms: Check engine light, coolant traces on the engine underside, dropping coolant level
+ 2 more engine weaknesses + vehicle weaknesses
Vehicle Weaknesses
| Weakness | Cost | |
|---|---|---|
| Hybrid system failure warning Faulty connectors, weak 12V battery or loose ground. Rarely actual hybrid defect. Symptoms: Warning message, reduced power, won't enter Ready mode from 20,000 km | Medium | |
| Hybrid drive cable corrosion at rear motor The high-voltage cable to the rear motor corrodes from road salt, causing hybrid system failure. Toyota Customer Support Program 22TE09 covers 8yr/100k mi. Symptoms: AM radio static while driving, hybrid system warning, vehicle fails to start | High | |
| Infotainment software glitches Multimedia system occasionally freezes, CarPlay/Android Auto disconnects. OTA updates improve but don't fully resolve. Symptoms: Screen frozen, audio drops, restart by holding power button from 20,000 km | Low |
Alternatives
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Known Problems and Issues +
A total of 13 weaknesses have been documented for the Toyota Sienna XL40 (2021–2025) — 5 engine-related and 8 vehicle-related. Typical issues affect Electronics, Suspension, Body, Brakes.
Sienna (A25A-FXS, 2021–2025) — Be Careful: Hybrid Battery: Moisture and Heat Protection, EGR System Clogged and EGR Cooler Leaking, Electric Water Pump Leaking. Power: 245 PS.
What to watch out for with the Toyota Sienna? See the detailed listing of all engine and vehicle weaknesses in the sections above.
Frequently Asked Questions
What problems and weaknesses does the Toyota Sienna XL40 have? +
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Last updated: February 2026 · All information without guarantee