[12Ounce]

I don't know much about this device, but might can share a little:
The sensor is a little plastic pointy device that just forward-of/below the radiator in the center/right of the vehicle. Under that plastic thing they call a bumper.
Check to see that the sensor elect connector is in place. Then try swapping with a neighbor-fellow-Winnie-owner-good-friend to see if the sensor is the problem.