Intake Air Temperature Sensor 1 Circuit High Input
The P0113 code means the vehicle's onboard diagnostic system has detected: Intake Air Temperature Sensor 1 Circuit High Input. This is a moderate severity code.
- Keep driving?
- Yes, but fix soon
- DIY difficulty
- easy
- Estimated cost
- $15-$150
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Common Symptoms
- Check Engine Light on
- Engine may run rich (PCM reads the air as very cold and adds fuel)
- Possible hesitation
- Slightly reduced power
Probable Causes (Ranked by Likelihood)
- IAT sensor open circuit (no reading) Very High
- Open signal wire between sensor and PCM High
- Sensor connector unplugged Moderate
- Failed sensor stuck reading extreme cold (high-voltage default near -40F) Moderate
Common Fixes by Vehicle
What techs usually find when diagnosing P0113 on specific vehicles — tap your vehicle for the fix and the exact part:
2009-2020 Ford F-150/Explorer 3.5L/5.0L easy DIY
The intake air temperature (IAT) sensor is integrated into the MAF sensor on Ford trucks. If the IAT reads -40F or extremely high, the sensor element has failed. Replace the entire MAF/IAT assembly (Motorcraft). Check the wiring connector for backed-out pins first. Also verify the air filter is not restricting airflow and causing heat soak. Confirm the exact part for your year and engine with a retailer's fitment lookup or your VIN before ordering - these applications split by engine and build date.
Labor: 15 min (connector check), 30 min (MAF replacement)2007-2017 Toyota Camry/Corolla 2.5L easy DIY
The IAT sensor on Toyota is integrated into the MAF sensor assembly. Check the connector for corrosion or water intrusion -- the connector sits low in the air box area and is exposed to moisture. If the signal reads high (above 4.9V), the circuit is open. Replace the MAF/IAT assembly (Denso). Also inspect the air filter box for water entry. Confirm the exact part for your year and engine with a retailer's fitment lookup or your VIN before ordering - these applications split by engine and build date.
Labor: 10 min (connector), 20 min (MAF replacement)2010-2020 Chevrolet Silverado/Equinox 5.3L/2.4L easy DIY
GM uses a standalone IAT sensor on some models and an integrated MAF/IAT on others. Check your model first. The standalone IAT sensor (ACDelco) is in the intake duct. Test resistance -- should be about 2.5K ohms at 68F. If resistance is too low (reads high temp), replace the sensor. Also check for a damaged air intake duct allowing hot engine air in. Confirm the exact part for your year and engine with a retailer's fitment lookup or your VIN before ordering - these applications split by engine and build date.
Labor: 15 minFrequently Asked Questions
A high IAT input makes the ECU think the air is very cold -- what does that do?
A high signal voltage corresponds to high sensor resistance, which the PCM reads as extremely cold intake air (often defaulting near -40F). Because cold air is denser, the PCM adds fuel, so the engine tends to run rich -- this can cause hard cold starts, over-fueling, reduced fuel economy, and in severe cases fouled spark plugs.
Mechanics Guide Step-by-step diagnosis
Step-by-Step Diagnostic Procedure
-
Check IAT voltage: above 4.7V at any temperature indicates an open circuit.
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Disconnect and reconnect the IAT sensor connector. If the code clears, the connector was loose.
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Check wiring continuity from sensor to PCM.
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Measure IAT sensor resistance and compare to temperature specification chart.
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Replace sensor if open internally.
Sources 2
This page is built from documented references. Verify against your own service info before repair work.
- SAE J2012Diagnostic Trouble Code Definitions (defines the generic OBD-II code ranges)
- Cross-checked against the SAE J2012:2002 DTC table (2026-08-27)archived scan of the SAE standard — readable copy, not SAE’s current edition
P0113 on Diesel, EV & Equipment
The same code ID appears across other engines and platforms. The diagnostic flow varies by manufacturer — these are the platform-specific breakdowns:
Commonly Affected Vehicles
- Honda Civic and Accord
- Ford Mustang
- Chevrolet Impala
- Nissan Frontier
- Toyota Matrix
Related Codes
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