No, Toyota Sienta doesn't have Auto Start/Stop.
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Here are the Seats and variants of Toyota Sienta:
No, Toyota Sienta doesn't have Sunshade.
Here are the Transmission and variants of Toyota Sienta:
No, Toyota Sienta doesn't have Sound Plus Functions.
Here are the Length*Width*Heigh(mm) and variants of Toyota Sienta:
No, Toyota Sienta doesn't have Collision Warning.
Here are the Road Tax and variants of Toyota Sienta:
Yes, Toyota Sienta is available in Multi-function Steering Wheel. The available Multi-function Steering Wheel variants are: 2018 Toyota Sienta 1.5V.
Here are the Rpm at Max torque and variants of Toyota Sienta: