- With a 3.0-liter V6 engine that generates 210 horsepower, the 2003 Toyota Sienna was among the more powerful minivans when it was introduced. The V6 features a multi-point fuel injection system and 10.5-to-1 compression ratio. The engine's cylinder bore is 3.44 inches, while the stroke measures 3.26 inches. Those dimensions, multiplied by the six cylinders, gave the engine its 3.0-liter displacement.
- Anti-lock brakes are standard on the 2003 Sienna. The minivan has ventilated front disc brakes and rear drum brakes. The 2003 Sienna has an independent strut suspension with stabilizer bar cushions in the front, with a torsion beam suspension in the rear.
- 2003 Siennas have a 114.2-inch wheelbase and a length of 194.2 inches from bumper to bumper. The curbside weight of the 2003 model is 3,919 lbs.
- The 2003 Sienna received five stars out of five in front and rear side impact testing by the National Highway Traffic Safety Administration. It received four out of five stars in rollover resistance.
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