Thinking about buying a used Toyota Sienna (2003–2010) in New Zealand? We've documented 5 known faults for this model spanning engine, transmission, cooling, and electrical. Each researched and verified before it's published. The most serious issues here are rated major. Two are set out in full below — the rest, with the symptoms, repair costs and checks for each, are free with an account.
5
Documented faults
Major
Most serious
$450–$3,200
Typical repair
5
Systems covered
Known Toyota Sienna faults
Every fault below is documented specifically for this model — researched and verified before it’s published.
012GR-FE Timing Chain Guide Wear & Rattle
MajorOccasionalEngine $1,800–$4,200 to fix
The 3.5-litre 2GR-FE V6 uses a dual-overhead-cam timing chain system with plastic-coated tensioner guides on both cam banks. From approximately 150,000 km onward, the plastic guide rails wear or crack, reducing tension on the timing chain. Early-stage wear produces a rattling or chattering noise from the front of the engine on cold start that typically fades within 30 seconds once oil pressure builds. As guides deteriorate further the noise persists at operating temperature and valve timing retards, causing power loss and rough idle. In severe cases the chain can jump a tooth or snap, resulting in catastrophic valve-to-piston contact. High-mileage NZ/AU examples are at elevated risk given the age of ACR50 stock.
Symptoms to notice
Metallic rattling or chain-slap noise from front of engine on cold start
Noise persisting beyond 30 seconds warm-up at higher mileage
Start the engine from fully cold and listen for chain rattle from the front-left of the engine. Note whether it clears within 15-20 seconds. Check oil service history — delayed oil changes accelerate guide wear. Inspect for oil sludge on the filler cap or dipstick. If a workshop inspection is possible: Scan for stored or pending OBD-II cam-timing codes.
Where to look: Front of engine — timing chain cavity behind the timing cover, both bank tensioner guide rails
Ask the seller
“Has the timing chain, tensioners, or guides ever been replaced?”
“Can you show oil service records confirming regular changes within 10,000 km intervals?”
“Has the engine ever thrown a check engine light related to cam timing or VVT?”
02Rear Power Liftgate Strut Hydraulic Failure
MajorCommonBody & Rust $280–$750 to fix
The ACR50 Sienna power rear liftgate relies on two hydraulic gas struts to hold the door open while the electric motor handles the opening and closing cycle. The hydraulic struts are subject to seal degradation over time, causing gas pressure loss. Failed struts allow the tailgate to fall freely when opened — a safety hazard causing head injury risk. The failure is progressive: early-stage struts hold the gate open slowly drooping, while fully failed struts offer no resistance. The power motor mechanism can mask the issue until the gate fails to hold position with the motor off. Strut failure is accelerated by New Zealand and Australian UV exposure degrading the rubber seals.
Symptoms to notice
Rear liftgate slowly droops or falls when opened and held stationary
Gate will not stay up without being manually supported
Gate falls quickly if motor power is disabled
Popping or hissing sound from struts when gate is operated
What to check
Open the rear liftgate fully using the power button then switch off the vehicle and observe whether the gate holds position for at least 60 seconds without drooping. Push the gate slightly downward — it should resist and spring back. Inspect the two cylindrical struts on each side of the opening for oil weeping or signs of corrosion on the shaft.
Where to look: Rear liftgate — two hydraulic gas struts mounted either side of the tailgate opening, between body pillar and gate inner frame
Ask the seller
“Have the rear liftgate struts been replaced?”
“Does the tailgate hold itself open without support?”
“Has the power liftgate ever needed repairs or adjustments?”
TransmissionMajor
CoolingMajor
ElectricalMajor
3 more documented faults on the Toyota Sienna
Symptoms, what to check, where to look and what to ask the seller — for every fault above. Free with an account, no card needed. One account covers one vehicle, so make it the car you’re actually looking at.
This page covers the model. Enter the plate of the actual car you’re looking at and see its year, engine, safety rating and register flags — free, no account needed.
Like any used car, it depends on the specific example and its service history. Across the 5 documented faults for the Toyota Sienna, the recurring problem areas are engine, transmission, and cooling. A Toyota Sienna with a full service history and no signs of the issues listed on this page can be a sound buy but each one needs to be checked individually before you commit.
What are the most common problems with a used Toyota Sienna?
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We've catalogued 5 known faults for the Toyota Sienna, covering engine, transmission, and cooling. Two are written out in full on this page. The rest — with the symptoms to notice, what to inspect, and typical repair costs for each — are free once you create an account.
How much do repairs cost on a Toyota Sienna?
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Most single repairs on the Toyota Sienna fall between $450–$3,200 at NZ independent-workshop rates. Some of the 5 documented faults cost less and a few cost considerably more, and no one car needs them all. Knowing which ones to look for before you view is what lets you negotiate the price down or walk away.
Should I get a pre-purchase inspection on a Toyota Sienna?
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Yes. A Toyota Sienna inspection focused on its known weak points is the single best way to avoid an expensive mistake. KickTyres gives you a guided, model-specific inspection plus a market valuation and negotiation figure for $17.90 far less than the cost of missing one of the faults on this page.