The Odyssey EX/EX-L/Touring/Elite’s lane departure warning system alerts a temporarily inattentive driver when the vehicle begins to leave its lane and gently nudges the vehicle back towards its lane. The Sienna doesn’t offer a lane departure warning system.
Both the Odyssey and the Sienna have standard driver and passenger frontal airbags, front side-impact airbags, driver knee airbags, side-impact head airbags, front seatbelt pretensioners, front-wheel drive, height adjustable front shoulder belts, plastic fuel tanks, four-wheel antilock brakes, traction control, electronic stability systems to prevent skidding, daytime running lights, rearview cameras, available crash mitigating brakes, blind spot warning systems, front and rear parking sensors and rear cross-path warning.
The engine in the Odyssey has a single overhead cam for simplicity. The engine in the Sienna has dual overhead cams, which add to the number of moving parts and the complexity of the cylinder heads.
On the EPA test cycle the Odyssey gets better fuel mileage than the Sienna FWD (19 city/28 hwy vs. 19 city/27 hwy).
An engine control system that can shut down half of the engine’s cylinders helps improve the Odyssey’s fuel efficiency. The Sienna doesn’t offer a system that can shut down part of the engine.
In heavy traffic or at stoplights the Odyssey Touring/Elite’s engine automatically turns off when the vehicle is stopped, saving fuel and reducing pollution. The engine is automatically restarted when the driver gets ready to move again. (Start/Stop isn’t accounted in present EPA fuel mileage tests.) The Sienna doesn’t offer an automatic engine start/stop system.
The Odyssey has a standard cap-less fueling system. The fuel filler is automatically opened when the fuel nozzle is inserted and automatically closed when it’s removed. This eliminates the need to unscrew and replace the cap and it reduces fuel evaporation, which causes pollution. The Sienna doesn’t offer a cap-less fueling system.
For better load carrying, ride, handling and brake cooling the Odyssey has standard 18-inch wheels. Smaller 17-inch wheels are standard on the Sienna L/LE/XLE.
The Odyssey has a standard easy tire fill system. When inflating the tires, the vehicle’s integrated tire pressure sensors keep track of the pressure as the tires fill and tell the driver when the tires are inflated to the proper pressure. The Sienna doesn’t offer vehicle monitored tire inflation.
For superior ride and handling, the Honda Odyssey has fully independent front and rear suspensions. An independent suspension allows the wheels to follow the road at the best angle for gripping the pavement, without compromising ride comfort. The Toyota Sienna has a rear torsion beam axle, with a semi-independent rear suspension.
To almost totally eliminate engine vibration in the passenger area, the Odyssey has an electronically controlled liquid-filled engine mounts. A computer controlled electric current in the liquid changes its viscosity, allowing the mount to dampen the engine completely at all RPMs. The Sienna uses conventional solid rubber engine mounts.
The front grille of the Odyssey uses electronically controlled shutters to close off airflow and reduce drag when less engine cooling is needed. This helps improve highway fuel economy. The Sienna doesn’t offer active grille shutters.
The Odyssey uses computer-generated active noise cancellation to help remove annoying noise and vibration from the passenger compartment, especially at low frequencies. The Sienna doesn’t offer active noise cancellation.
The Odyssey has .4 inches more front legroom, 3.3 inches more rear legroom and 1.8 inches more third row legroom than the Sienna.
To make loading groceries and cargo easier when your hands are full, the Odyssey Touring/Elite’s cargo door can be opened and closed just by kicking your foot under the back bumper, leaving your hands completely free. The Sienna doesn’t offer a hands-free gesture to open its cargo door, forcing you to put cargo down if your hands are full.
If the windows are left down on the Odyssey the driver can raise them all using the key in the outside lock cylinder. On a hot day the driver can lower the windows from outside the vehicle using the key in the outside lock cylinder or the keyless remote. The driver of the Sienna can only operate the windows from inside the vehicle, with the ignition on.
Standard air-conditioned seats in the Odyssey Elite keep the driver and front passenger comfortable and take the sting out of hot seats in Summer. The Sienna doesn’t offer air-conditioned seats.
The Odyssey Touring/Elite has a standard center folding armrest for the third row rear passengers. A center armrest helps make rear passengers more comfortable. The Sienna doesn’t offer a third row rear seat center armrest.