P0099 Mini Intake Air Temperature Sensor 2 Circuit Intermittent/Erratic

Possible causes

– Faulty Intake Air Temperature sensor
– Intake Air Temperature sensor harness is open or shorted
– Intake Air Temperature sensor circuit poor electrical connection

Symptoms

– Engine Light ON (or Service Engine Soon Warning Light)

P0099 Mini Description

The Intake Air Temperature (IAT) sensor contains a semiconductor device which changes the resistance based on the temperature (a thermistor). The IAT sensor is located in the air intake passage of the engine air induction system. The IAT sensor has a signal circuit and a ground circuit.