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Check The Intake Air Temperature Sensor Unit

WARNING: This page is about a different car, the 2013 Subaru Impreza. However, it is still accessible from the selected car via links, so may be relevant.

Measure the resistance between intake air temperature sensor terminals.

Fig 1: Measuring Resistance Between Intake Air Temperature Sensor Terminals
G08538770Courtesy of SUBARU OF AMERICA, INC.
Temperature Terminal No. Standard
-20°C (-4°F) 1 and 2 16.0±2.4 kΩ
20°C (68°F) 2.45±0.24 kΩ
60°C (140°F) 0.580±0.087 kΩ