P0113: Intake Air Temperature Sensor 1 Circuit High
The intake air temperature sensor voltage is too high, so the computer thinks the incoming air is extremely cold.
What P0113 means
P0113 is the opposite of P0112. The intake air temperature signal is stuck above roughly 4.5 volts, which the computer reads as very cold air. KBB points out that a high circuit reading of around 5 volts tells the computer the air is about minus 40 degrees F, which is really a sign of an open circuit, not cold weather. That is why an unplugged connector after an air filter change is one of the most common causes. Others include a broken wire, a corroded pin or a failed sensor. On many cars the IAT sensor lives inside the MAF sensor housing. With the wrong air temperature, the computer adds extra fuel and may adjust timing, which can cause hard starting and lower mileage. Shops check the live IAT reading, wiggle the harness and measure voltage and resistance at the sensor. Unplugging the sensor and jumping the signal to ground with a test lead should make the reading swing hot, which proves the wiring is good.
Common symptoms
- Check engine light on
- Hard starting
- Hesitation on acceleration
- Lower gas mileage
- Often no other symptoms
Most common causes
- IAT sensor unplugged or connector loose
- Open circuit in the sensor wiring
- Failed IAT sensor
- Faulty MAF sensor with a built-in IAT
- Corroded connector pins
What to check yourself first
Make sure the IAT or MAF connector was not left unplugged after an air filter change, which is a very common cause. Check for a broken wire. A scan tool reading of about minus 40 degrees F means the computer sees an open circuit.
Typical fixes and what they cost
| Fix | Typical cost | Note |
|---|---|---|
| Replace intake air temperature sensor | $119-$142 | For a standalone sensor, usually in the air box or intake tube. |
| Replace mass airflow (MAF) sensor | $274-$381 | If the IAT is part of the MAF sensor assembly. |
| Electrical diagnosis to find a wiring or connector fault | $122-$179 | For an open wire or loose connector. |
Typical US price ranges for parts and labor, not quotes. Your shop should confirm the cause with a diagnostic before replacing parts.
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Related codes
- P0112 Intake Air Temperature Sensor 1 Circuit Low
- P0101 Mass or Volume Air Flow "A" Circuit Range/Performance
- P0118 Engine Coolant Temperature Sensor 1 Circuit High
- P0100 Mass or Volume Air Flow "A" Circuit
- P0128 Coolant Thermostat (Coolant Temperature Below Thermostat Regulating Temperature)