Toyota Sienna XL20
Weaknesses, engine ratings and buying advice
Generations
Engine Overview
The Toyota Sienna XL20 is available with 2 engine variants — from 215 to 295 hp.
3.3L V6 succeeding the 1MZ-FE. Lower sludge risk thanks to revised PCV from the factory. Valve cover gaskets leak similarly to the predecessor. Solid engine for minivan and SUV duty.
- !! Lower risk than the 1MZ-FE thanks to revised PCV, but still possible with very extended oil change intervals. from 120,000 km
Lower risk than the 1MZ-FE thanks to revised PCV, but still possible with very extended oil change intervals.
Symptoms: Thick oil, oil pressure fluctuations - ! Same issue as the 1MZ-FE, but somewhat less common. Rear gasket is difficult to access. from 130,000 km
Same issue as the 1MZ-FE, but slightly less common. Rear gasket with poor access.
Symptoms: Oil smell, oil drops under engine
3.5L V6 — Toyota's universal six-cylinder for midsize through SUV. Cam tower oil leak like the Tundra V8, but less common. Budget for water pump around 80k miles. Overall one of the most reliable V6 engines on the market, 250k+ mile lifespans documented.
- !! VVT-i oil line rupture (engine damage risk!) from 60,000 km
Rubber VVT-i oil supply hose on pre-April 2008 engines can suddenly rupture and dump all engine oil in 30 seconds. Toyota LSC 90K: replacement with metal line.
Symptoms: Sudden large oil puddle under engine, oil pressure warning, engine noise - !! Cam tower RTV sealant ages — oil leak at front of engine from 150,000 km
RTV sealant at cam tower ages. Same issue as Toyota V8 engines, less common on V6.
Symptoms: Oil smell, oil trail at front of engine - !! Water pump with plastic impeller wears out from 130,000 km
Water pump with plastic impeller wears out. Replace during timing belt/chain service.
Symptoms: Coolant loss, drip under engine
+ 1 more engine weaknesses + vehicle weaknesses
Vehicle Weaknesses
| Weakness | Cost | |
|---|---|---|
| Wiring in door mechanism frays, lock motors fail. Toyota extended warranty to 9 years/120,000 miles for 2004–2010. Affects a very large number of vehicles. Wiring in door mechanism frays, lock motors fail. Toyota extended warranty to 9 years/120k miles for 2004-2010. Affects very many vehicles. Symptoms: Door won't open/close automatically, clicking, warning light from 120,000 km | Medium | |
| O2 sensor failure (P0136/P0156) Downstream O2 sensors fail more often than expected. Symptoms: Check engine, VSC warning, increased consumption from 110,000 km | Low |
Top Reported Issues
Alternatives
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Known Problems and Issues +
A total of 12 weaknesses have been documented for the Toyota Sienna XL20 (2004–2010) — 6 engine-related and 6 vehicle-related. Typical issues affect Electronics, Interior, HVAC, Other. Considered reliable: 3MZ-FE (3.3L V6).
Sienna (2GR-FE, 2007–2010) — Be Careful: VVT-i oil line rupture (engine damage risk!), Cam tower RTV sealant ages — oil leak at front of engine, Water pump with plastic impeller wears out. Power: 266 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 XL20 have? +
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Which Toyota Sienna XL20 engine is the most reliable? +
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Last updated: February 2026 · All information without guarantee