Common Symptoms
- Check Engine Light illuminated
- Poor fuel economy
- Hard starting in cold weather
- Rough idle or hesitation during acceleration
- Black smoke from exhaust under load
- Engine runs rich or lean
Most Likely Root Causes
- Faulty intake air temperature sensor
- Damaged or corroded wiring harness to IAT sensor
- Loose or poor electrical connection at IAT sensor connector
- Contaminated or dirty IAT sensor element
- Shorted or open circuit in IAT sensor wiring
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Component Location
The intake air temperature sensor is typically integrated into the mass airflow sensor housing or mounted in the intake air duct near the air filter box.
Manufacturer Notes
Some manufacturers integrate the IAT sensor into the MAF sensor assembly requiring replacement of the complete unit if sensor circuit fails.
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