2007 Toyota Sienna Problems: 12 Known Issues

On the 2004-2010 Toyota Sienna, on second-generation (XL20) Siennas the rear coil springs corrode where the bottom coil sits in the lower spring seat, which traps road salt and moisture. The spring rusts through at that contact point and snaps, usually within the last coil. Independent Toyota shops in the salt belt report seeing this often enough that they inspect every 2004-2009 Sienna for it on each visit, and both rear springs frequently break in the identical location. A broken spring end can drop onto and slice the rear tire sidewall, which makes this a safety issue rather than just a ride-quality complaint. There is no recall covering it and Toyota has provided no goodwill assistance.

On the 2004-2010 Toyota Sienna, front wheel bearings are a high-frequency wear item on the XL20 Sienna, which carries substantial front axle weight. The failure presents as a droning or humming that rises with road speed and changes character when the van is steered - loading the opposite side quiets a bad bearing, so a noise that worsens in a right turn indicates the left bearing. Unlike many contemporaries, the XL20 uses a separate press-in bearing and hub rather than a bolt-on cartridge, which drives the labor cost and surprises owners who priced the job from a generic estimate.

On the 2004-2011 Toyota Sienna, the underbody spare tire carrier on second-generation Siennas is exposed to road-salt spray because the water splash protector is inadequate. The steel hoist cable corrodes where it enters the carrier mechanism, and the cable can eventually fail and release the full-size spare tire onto the roadway. Toyota ran two campaigns: 10V-160 in 2010 (1998-2010 vans) and a second campaign, 14V-273, covering 2004-2011 vans in the 20 salt-belt states plus DC. Owners who had the first campaign performed are still required to have the second remedy done - the 2010 repair did not fix the vehicle. Many vans in the field still show as open on this recall, and corroded carriers also make the spare impossible to lower when it is actually needed.

On the 2007-2016 Toyota Sienna 3.5L 2GR-FE, the 3.5L 2GR-FE V6 commonly develops oil leaks from the VVT-i oil line, timing cover, and valve cover gaskets. The rubber section of the VVT-i oil supply hose degrades over time and can leak (Toyota covered certain 2007-2010 Siennas under Limited Service Campaign 90K, now expired), dripping oil onto the exhaust manifold creating a burning smell and fire risk.

On the 2007-2016 Toyota Sienna 2GR-FE, the 3.5L 2GR-FE V6 in 2nd and 3rd generation (2007-2016) Siennas can consume 1 quart of oil every 2,000-3,000 miles. Worn piston rings and valve stem seals are the primary causes. The issue is more prevalent in vehicles driven primarily in city stop-and-go conditions where the engine rarely reaches full operating temperature.

On the 2004-2010 Toyota Sienna, the hydraulic power steering rack on 2004-2010 (second-generation) Sienna models develops internal seal leaks that allow power steering fluid to weep from the rack boots or the input shaft seal. The leak starts slowly but progressively worsens, leading to low fluid level, groaning pump noise, and eventually heavy steering effort. The leak is typically visible as fluid dripping from the rubber boots at either end of the steering rack or from the area where the steering column connects to the rack.

On the 2004-2010 Toyota Sienna, the intermediate shaft that links the steering column to the rack carries a U-joint that rusts and binds on older Siennas, especially in salt states. The result is a stiff, notchy, catchy feel just off center and a clunk or pop from the dash/firewall area on turn-in or over bumps. Owners routinely misdiagnose this as a failing power steering pump or rack and replace expensive parts with no change - forum threads document owners replacing struts, mounts, control arms, tie rods and sway bar links before finding the shaft. A penetrating-lubricant spray on the U-joint that temporarily restores smooth steering effort is the classic confirmation test.

On the 2004-2016 Toyota Sienna, power sliding doors on 2nd and 3rd gen Siennas are prone to cable fraying, motor failure, and latch mechanism issues. Doors may refuse to open/close, reverse mid-travel, or make grinding noises. The cable assembly inside the door wears and eventually snaps.

On the 2004-2010 Toyota Sienna, 2nd-gen Sienna dashboards are notorious for cracking, warping, and developing a sticky/melting surface, especially in hot climates. The dashboard material degrades from UV exposure and heat, creating a hazardous glare and releasing a sticky residue.

On the 2004-2010 Toyota Sienna, xL20 all-wheel-drive Siennas were sold with run-flat tires and no spare of any kind, because the rear driveshaft occupies the underfloor space where the FWD van carries its spare. Owners hit three compounding problems: the OE run-flats wore out unusually fast (Toyota ultimately offered a tread-wear warranty on the original-equipment tires), replacement run-flats in that size are expensive and available from very few makers, and a puncture beyond the run-flat's limited range leaves the van with no spare option. Toyota's factory answer was a spare-tire kit, sold at owner expense (about $900), that takes up a third-row seating position. This is an XL20 AWD-specific constraint - FWD XL20 vans carry an underbody spare on the carrier that is subject to a separate corrosion recall.

On the 2004-2025 Toyota Sienna, the lower sliding-door rail and the seam where the rocker panel meets the sill trap salt, grit and water on Siennas run in the salt belt. Rust starts inside the lower door track and in the rocker seam under the sliding doors, then perforates outward and can eat into the structural rocker/frame area. Because the rail is a load-bearing part of the sliding-door mechanism, corrosion here also causes rough or binding door travel and eventually contributes to power-door faults. Owners report the same corrosion-prone rail design persisting into the fourth generation, not only the older vans. Corroded aluminum A/C lines running along the same underbody area are a frequent companion finding, with dealer A/C repair quotes in the $1,700-$2,500 range.

On the 2004-2010 Toyota Sienna, high-mileage XL20 Siennas commonly set P0420 (Bank 1) and sometimes P0430 (Bank 2) for catalyst efficiency below threshold. On this V6 layout Bank 1 is the rear (firewall) bank and Bank 2 the front, and the van carries four sensors: two upstream air/fuel ratio sensors and two downstream heated oxygen sensors. The most frequent real cause is a lazy downstream sensor whose switching has slowed with age, not a dead converter - but shops routinely quote catalytic converter replacement first, which on this van is a four-figure job. Exhaust leaks upstream of the rear sensor and unresolved misfires also set the code.