Common Symptoms
- Check Engine Light illuminated
- Poor fuel economy
- Rough idle or hesitation during acceleration
- Hard starting in cold weather
- Black smoke from exhaust under load
- Engine runs rich or lean intermittently
Most Likely Root Causes
- Damaged or corroded IAT sensor wiring connector
- Intermittent short or open in IAT sensor circuit
- Failing intake air temperature sensor
- Corrosion or water intrusion in sensor connector pins
- Chafed wiring harness near engine heat sources
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Component Location
The IAT sensor is typically integrated into the MAF sensor housing or mounted separately in the intake air duct between the air filter and throttle body.
Manufacturer Notes
Some manufacturers use a combined MAF/IAT sensor where intermittent faults may require replacement of the entire assembly rather than individual components.
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