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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 1 And 2
G06344675Courtesy 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