I had a similar situation shortly after replacing all my tires and though the tires were brand new they did not replace the valve stems and they had slow leaks in two of the four tires, this may be your problem. The tire pressure sensors can be very sensitive.
in the engine compartment
The recommended tire pressure for OEM tires on a Toyota Sienna is 35 psi, but you should pay attention to and follow the tire manufacturer's specifications for any aftermarket brand of tires that you purchase.
Because one or more of the tires is low. If you just had replaced one o more tires, there is need to reset the warning light.
Just had the rear bumper replaced. Part cost about $210
Low tire pressure on the 2011
toyota sienna 2001
where is the classis location for toyota sienna
It is located on the left side of the engine on the larger line.
How to replace a starter in a 2009 toyota sienna
The 2009 Toyota Sienna has a V6 engine.
The 2013 Toyota Sienna has a V6 engine.
The 2014 Toyota Sienna has 24 valves.