The IAT sensor is a negative temperature coefficient (NTC) thermistor that decreases in resistance as the temperature of the sensor increases. Its purpose is to measure the temperature of the air entering the engine and provide this data to the PCM.

What happens when an IAT sensor goes bad?

Rough idling and rough running Engine stalling, rough idling, engine stumbling, and random surges of power are commonly associated with IAT sensor failure. These are concerning symptoms, and they can only worsen with time.

What is an IAT circuit?

The IAT sensor uses the air density and air temperature in the car’s environment and analyzes it to determine the correct amount of spark and fuel injected. This helps the engine to start up on a cold day and also keeps consistent fuel economy during hot days.