-40f is the default temperature for an open ambient temperature sensor circuit. The sensor is on the bumper cover on the left front corner if the car. There is a grill section below the bumper between the fog lights. The sensor is located on the drivers corner of that part of the bumper. With the sensor unplugged, there should be a 5v signal on the dark green/white wire and ground on the yellow. With the sensor connected normal operating voltage will range from about 1.5v to 4v depending on the temperature. (colder = higher voltage)
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