P1113
VWIntake Air Temperature (IAT) Sensor 1 Circuit Open/Short
Medium SeverityThis code indicates that the engine's computer is not receiving a correct signal from the Intake Air Temperature (IAT) Sensor, often due to an electrical open circuit or short. This fault can lead to incorrect fuel mixture calculations, impacting engine performance and fuel efficiency.
⚠️ Before You Begin (Safety First)
Always ensure the engine is off and cool before working on any engine components. Disconnect the negative battery terminal before inspecting or replacing electrical sensors to prevent electrical shock or damage to the vehicle's electrical system.
Common Symptoms
- Check Engine Light illuminated
- Rough idle or stalling
- Poor fuel economy
- Reduced engine power
- Engine runs rich or lean
- Difficulty starting the engine
Common Causes
- Faulty Intake Air Temperature (IAT) sensor
- Open circuit in the IAT sensor wiring
- Short circuit in the IAT sensor wiring
- Corroded or loose electrical connectors at the IAT sensor or PCM
- Damaged wiring harness
Frequently reported on: VW Jetta (2000-2005), VW Golf (1999-2006), VW Passat (1998-2005), Audi A4 (1998-2005), Skoda Octavia (1998-2004)
Diagnostic Steps
- Locate the Intake Air Temperature (IAT) sensor (often found in the intake manifold or air intake tube).
- Visually inspect the sensor and its electrical connector for any obvious damage, corrosion, or loose connections.
- Carefully disconnect the electrical connector from the IAT sensor.
- Using an ohmmeter, test the resistance of the IAT sensor. Compare the reading to your vehicle's service manual specifications (resistance typically changes with temperature).
- If the sensor tests bad or shows an open/short circuit, replace the IAT sensor with a new, OEM-compatible part.
- Clear the P1113 code from the vehicle's computer using an OBD-II scanner and test drive the vehicle to confirm the repair.
👨🔧 When to Call a Professional
While replacing the Intake Air Temperature (IAT) Sensor is often a straightforward DIY task, if the code persists after replacement and inspection of the wiring, it's time to consult a professional mechanic. This could indicate a deeper electrical issue within the engine control unit or wiring harness that requires specialized diagnostic tools.
Commonly Asked Questions
What does P1113 specifically mean for my VW?
For VW vehicles, P1113 indicates a problem with the Intake Air Temperature (IAT) Sensor 1 circuit, specifically an open or short circuit, meaning the engine computer is not getting a valid temperature reading from the sensor.
Can I drive with a P1113 code?
While you can typically drive with this code, it's not recommended for extended periods. The engine's performance, fuel economy, and emissions will be negatively affected, and prolonged driving could potentially lead to other issues if the engine runs too rich or lean.
Where is the IAT sensor usually located on a VW?
The IAT sensor on VW vehicles is commonly integrated into the Mass Air Flow (MAF) sensor or located separately in the air intake tube or intake manifold, after the air filter and before the throttle body.
Do I need to replace the MAF sensor if my IAT sensor is faulty?
Not necessarily. If your IAT sensor is a separate component, you only need to replace the IAT sensor. If your IAT sensor is integrated into the MAF sensor, then replacing the MAF sensor unit will resolve both issues.
How can I test the IAT sensor myself?
You can test the IAT sensor by disconnecting its electrical connector and measuring its resistance using an ohmmeter. The resistance should change significantly when the sensor is exposed to different temperatures (e.g., using a heat gun or ice water). Compare your readings to the specifications in your vehicle's service manual.