P0113
Intake Air Temperature Sensor 1 Circuit High Input
The computer thinks the incoming air is extremely cold because the intake air temperature sensor signal is too high. This is usually caused by a bad sensor, damaged wiring, a poor connector, or sometimes a problem with the mass air flow sensor.
- SEV
- 3/5
- DRIVE
- CAUTION
- DIY
- $10–$120
- SHOP
- $100–$350
Quick answer
AI-CITATION READYWhat it means
Can you drive with it?
Most common causes
- Faulty or corroded intake air temperature sensor wiring or connections
- Defective intake air temperature sensor
- Defective mass air flow sensor with built-in intake air temperature sensor
Typical repair cost
DIY usually runs $10–$120. Typical shop repair lands around $100–$350, depending on the root cause.
01 / Definition
P0113 sets when the powertrain control module detects an intake air temperature sensor voltage that is above the normal range for too long. On most systems, a high input means high voltage from the sensor circuit, which usually indicates an open circuit, failed sensor, or disconnected wiring. Some vehicles have the IAT sensor built into the mass air flow sensor assembly.
02 / Drive status
With caution. You can usually drive short distances, but the engine may run poorly, use more fuel, or be harder to start. Repair it soon to avoid drivability problems and increased emissions.
03 / Symptoms
- Check engine light on
- Hard starting, especially when cold
- Rough idle
- Poor fuel economy
- Hesitation during acceleration
- Reduced engine performance
- Rich running condition
- Black exhaust smoke in some cases
04 / Causes
| 1 | Faulty or corroded intake air temperature sensor wiring or connections | high |
|---|---|---|
| 2 | Defective intake air temperature sensor | high |
| 3 | Defective mass air flow sensor with built-in intake air temperature sensor | medium |
| 4 | Dirty air filter affecting airflow readings and contributing to sensor-related faults | low |
05 / Diagnostic sequence
- 01Scan for stored codes and freeze frame data, then check for related MAF or IAT codes.
- 02Inspect the intake air temperature sensor connector for looseness, corrosion, bent pins, or water intrusion.
- 03Check the wiring harness for damage, rubbing, broken wires, or an unplugged sensor.
- 04Compare intake air temperature data on a scan tool to ambient temperature with a cold engine.
- 05Measure sensor resistance and compare it to the manufacturer specification at the current temperature.
- 06Check for a 5-volt reference and ground at the sensor connector if applicable.
- 07If the IAT is integrated into the MAF sensor, inspect and test the MAF assembly and connector.
- 08Inspect the air filter and intake duct for heavy dirt, restriction, or improper installation.
- 09Repair the fault, clear the code, and road test to confirm the fix.
06 / Repairs
| 1 | Repair or clean corroded intake air temperature sensor connector terminals and damaged wiring. | $10–$100 |
|---|---|---|
| 2 | Replace the intake air temperature sensor if it fails testing. | $15–$80 |
| 3 | Replace the mass air flow sensor assembly if the intake air temperature sensor is built in and the unit is faulty. | $80–$250 |
| 4 | Replace a dirty or restricted air filter and inspect the intake ducting. | $15–$40 |
| 5 | Clear codes and verify proper intake air temperature readings during a road test. | $0–$50 |
MFG / Manufacturer notes
These supplements add make-specific diagnostic framing. Pages without full matrix backing or lane approval stay guarded and canonicalize back here until they are explicitly approved for indexing.
- Open
Audi P0113
Approved indexable child page
07 / Related codes
08 / FAQ
What does P0113 mean?
It means the engine computer is seeing an intake air temperature sensor signal voltage that is too high. This usually points to an open circuit, bad sensor, or connector problem.
Can a bad air filter cause P0113?
A dirty air filter is not the most common cause, but it can contribute to airflow and sensor issues on some vehicles. Wiring and sensor faults are much more common.
Is P0113 the same as a bad MAF sensor?
Not always. Some vehicles have a separate IAT sensor, while others build it into the MAF sensor. If the IAT is integrated, a bad MAF assembly can set P0113.
Will P0113 cause poor fuel economy?
Yes. Incorrect intake air temperature data can cause the computer to miscalculate fuel delivery, which may increase fuel consumption.
Can I replace the intake air temperature sensor myself?
On many vehicles, yes. It is often a simple part to access and replace, but you should inspect the wiring and connector before installing a new sensor.
09 / Source and method
- DATA BASIS
- OBD-II REFERENCE + OBD2.HELP
- METHOD
- STATIC VALIDATION
- SAFETY
- INFORMATIONAL
This page combines OBD-II diagnostic reference data with OBD2.help generated diagnostic guidance for code meaning, likely causes, and repair direction.
Publishing uses deterministic schema and build validation, plus manual spot checks on representative pages before release.
Safety-critical diagnosis and repairs should be confirmed with a qualified mechanic, especially when the vehicle is misfiring, overheating, or losing power.