The launch-year gremlins are gone and one complaint is left standing — go and feel the brakes for yourself.

Specific to 2022 Siennas 'equipped with seating for eight passengers'. Toyota found that an incorrect seat-belt webbing guide may have been fitted to the outboard second-row belt assemblies, and the consequence is precise: 'During seat belt pre-tensioner deployment, the incorrect webbing guide may damage the seat belt webbing, causing it to tear.' The pre-tensioner is the device that snatches the belt tight at the start of a crash — so this is a fault that only shows up at the worst possible moment. Dealers replace both outboard second-row belt assemblies free; Toyota's codes are 21TB08 and 21TA08 and owner letters went out on 10 January 2022. If the van you are looking at has eight seats, verify this one against the VIN specifically. Seven-seat vans with captain's chairs in the second row are not affected.

A 2025 campaign covering 2021–2025 Sienna Hybrids: 'The bolts for the seatbacks on the third-row seat assemblies may not be tightened properly.' Toyota lists it as failing three federal safety standards — head restraints, seating systems, and child restraint anchorages. That last one is the reason to take a bolt-tightening recall seriously in a minivan: it is the standard that governs the anchor points a child seat clips into. Dealers tighten the bolts free (Toyota code 25TA05); owner letters were mailed on 1 April 2025. Note that the remedy addresses the third row only — an owner on the sibling launch year went in with a second-row rattle and was told this recall does not cover it.

A Customer Support Program, not a recall — quiet extended coverage outside the normal warranty, which means it will not show up in a VIN recall search and you have to ask a Toyota dealer for it by name. Toyota's description: coverage 'for repairs related to excessive corrosion to the wire harness connections at the Rear Motor Generator. Excessive corrosion can cause AM Radio Static during certain drive cycles, or the vehicle may not start.' On an all-wheel-drive Sienna the rear wheels are driven by an electric motor, and this covers the high-voltage floor harness and rear traction motor cable that feed it. The symptom is genuinely strange — crackling on the AM band while driving — so treat that as a diagnostic clue rather than a bad radio. On coverage: Toyota's bulletin states these parts are covered by the New Vehicle Limited Warranty for three years or 36,000 miles, but that is the ordinary factory warranty, not the program, and the program's own window is not stated in the bulletin summary. Verify the terms in the bulletin PDF and have a dealer check the VIN. Toyota's own technical instructions disagree on the year span — one says 2021–2022, a later one says 2021–2024 — which is a further reason to check by VIN. Salt-belt vans carry the exposure.

The second cluster on this year, and it is minor by comparison. Driver's seat assemblies working loose and cracking, producing loud popping noises as the seat moves — one owner had the components replaced under warranty in January 2024 and the fault returned once the warranty had lapsed. A seat retractor failing with a white plastic part visible. A driver-side control panel trim piece repeatedly snapping off. Rear seats that do not lock down when folded. Driver's seat stitching tearing just past the three-year, 36,000-mile warranty. There are also two glass reports worth noting because they recur across fourth-generation years: a rear windscreen that shattered with nobody near the van, confirmed on a home security camera, and a sunroof that shattered while open at around 122,000 miles. On the electrical side, one van required a hybrid vehicle control unit and a 12-volt battery for a recurring lane-tracing and cruise-control fault, and another had its Entune 3.0 head unit replaced four times without resolution.

The 2.5-litre hybrid engine, internally the A25A-FXS, is the same unit that launched in the 2018 Camry, and our mechanic source calls it 'relatively problem-free'. Toyota's bulletin file shows three separate oil-leak points it has been chasing on this engine family: at the junction of the camshaft cover, camshaft housing and timing chain covers, typically on the exhaust side, covering 2021–2025 Sienna Hybrid among others; the head or valve cover gasket on North-American-built A25A engines from 2020 to 2022; and between the lower oil pan and the crankcase on 2021–2022 vans. There is also a bulletin for milky or discoloured engine oil with an 'Oil Pressure Low' warning on the dash. None of these is a failure pattern in the complaint file, but they are cheap to check: have the engine looked at on a lift, pull the dipstick and look at the oil's colour, and ask about oil-consumption history.