Intake Air Temperature Sensor 1 Circuit
What does P0110 mean?
The P0110 code means the vehicle's onboard diagnostic system has detected: Intake Air Temperature Sensor 1 Circuit. This is a moderate severity code.
Common Symptoms
- Check Engine Light on
- Poor cold-start performance
- Slightly reduced fuel economy
- Possible rough idle in cold weather
Probable Causes (Ranked by Likelihood)
- Faulty IAT sensor Very High
- Wiring damage or corrosion at connector High
- Open or short in IAT signal circuit Moderate
- Damaged MAF sensor housing (IAT integrated in MAF) Moderate
Step-by-Step Diagnostic Procedure
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Locate the IAT sensor (often integrated into the MAF sensor housing or in the intake duct).
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Check IAT sensor resistance: at room temperature (~70F) resistance is typically 2,000-3,000 ohms. Resistance decreases as temperature rises.
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Compare IAT reading on scan tool to ambient temperature. A reading of -40F or 300F+ indicates a circuit fault.
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Inspect connector and wiring for corrosion or breaks.
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If IAT is part of the MAF sensor, replacing the MAF fixes both.
Frequently Asked Questions
What does the IAT sensor do?
The intake air temperature sensor measures the temperature of air entering the engine. The ECU uses this to adjust fuel delivery and ignition timing since cold air is denser than warm air.