CodeXOBD

P0110 — Intake Air Temperature Circuit Malfunction

P0110 means the module detected an electrical fault in the intake air temperature sensor circuit. A failed sensor or wiring problem is the usual cause.

Low

The engine runs using a default air temperature value, which may cause slightly rich or lean running depending on actual conditions.

$10–$100Parts, typical range
0.2–0.5 hLabour
estimateNot a quote · 2026 basis

What P0110 means

The intake air temperature sensor measures the temperature of air entering the engine. The module uses this data to calculate air density and adjust fuel delivery. P0110 sets when the sensor signal is out of the expected voltage range — either too high (open circuit, very cold) or too low (shorted, very hot). Many vehicles combine the IAT sensor with the MAF sensor in a single housing.

Technical summary
SystemPowertrain — fuel and air metering
How the fuel mixture is decidedAir passes the mass airflow sensor, then the throttle, into the intake manifold and the cylinder. The module injects fuel to match the measured air, and the upstream oxygen sensor reports the result so it can correct itself. Air entering after the sensor was never measured, which is why a leak downstream of it makes the mixture run lean.Air inAirflow sensormeasures massThrottleCylinderfuel added hereO₂ sensorreports resultAny air entering after the sensor is fuel the module never accounted for

Symptoms you may notice

What causes P0110

IAT sensor has failed

Very likelylow costeasy

The sensor's internal thermistor has opened or shorted, producing a signal outside the valid range.

Wiring or connector fault in the IAT circuit

Likelylow costeasy

A broken wire or corroded connector in the IAT circuit can produce an open or shorted signal.

IAT sensor integrated in MAF housing has failed

Possiblemedium costeasy

On many vehicles the IAT is part of the MAF sensor assembly. A MAF problem can therefore trigger both P0100-series and P0110 codes.

How to diagnose it

1

Locate the IAT sensor

Identify whether the IAT is a standalone sensor in the intake tract or integrated into the MAF sensor housing.

Tools: Service manual or repair databaseIf it passes: Sensor is located. Continue to step 2.If it fails: Consult the service manual for the specific vehicle.
2

Measure sensor resistance

Disconnect the sensor and measure resistance across its terminals. Resistance should change with temperature — approximately 2,500 ohms at 20C and 300 ohms at 80C.

Tools: MultimeterExpected: Varies with temperature (2,000-3,000 ohms at room temp)If it passes: Resistance changes smoothly with temperature. Check the wiring.If it fails: Open circuit, shorted, or no change — replace the sensor.
3

Inspect the IAT connector and wiring

Check the sensor connector for corrosion, bent pins, or water intrusion. Trace the wiring back toward the module for chafed or broken wires.

Tools: Inspection light, Electrical contact cleanerIf it passes: Connector and wiring are intact. The sensor is confirmed faulty.If it fails: Clean the connector or repair the wiring.

Related codes

P0111P0112P0113

Common questions

Where is the IAT sensor located?

Usually in the intake manifold or air cleaner housing. On many modern vehicles it is built into the MAF sensor assembly.

Last verified 2026-07-27 · Sources: SAE J2012 — Diagnostic Trouble Code Definitions and Failure Type Byte (SAE International)

This information is for general guidance and is not a substitute for professional diagnosis. Cost figures are estimates, not quotes.