While on vacation our Sienna sat for one week at the airport. When we got back, it was dead. The thermometer to read outside temperatures is reading 14 degrees too hot. Any suggestions?

sound like faulty out side air temperature sensor located center radiator support.

If a battery is below 9.6-volts or is charging above 16 -volts , you get all kinds of goofy electrical issues

clean your map sensor first not reading air temp

it should be about 40 degrees blow the outside ambient temperature.

its not in the engine area, its nearer toward the bumber area, and replace the sensor

the outside temperature sensor on vehicles takes the temperature of the air about 2-3 inches off the ground, that close to the ground it might be a couple degrees colder than the temperature on the thermometer you have mounted in the window of your house.

In that case, whenever u take it for a ride and return to your nest, lift the hood and disconnect the battery terminal which I would recommend having a clip(spring loaded clamps with metal jaws) removed from the battery. Next time you use it, first reattach the clamps to the batter, and start normally.......sodeep

bad temp sensor. when you open the hood look where the hood latch is and the sheet metal bar in middle right behind grill there is a clip with a sensor on a wire, sensor is black about 1.5 inches disconnect get new one at store, replace

I would guess the outside thermometer has lost its calibration.
Does it seem consistently 5, 10 or 20 degrees off all the time?
Let me know.
Regards,

my thermometer is blinking -40 degrees how can i fix this