P0113 Code: Intake Air Temperature (IAT) Circuit High Input
Note: We do not currently have verified model-specific diagnostic data for the Audi A3. The symptoms and fixes listed below are the standard generic OBD2 guidelines for the P0113 code. Always consult a factory service manual before replacing parts.
What does this mean?
Code P0113 signifies that the Powertrain Control Module (PCM) is receiving an excessively high voltage signal from the Intake Air Temperature (IAT) sensor. A high voltage signal from the IAT sensor typically corresponds to a very low or extremely cold intake air temperature reading. This erroneous input can lead the PCM to incorrectly enrich the fuel mixture, retard ignition timing, or alter transmission shift points, potentially resulting in poor fuel economy, increased emissions, rough idling, or a lack of power. The PCM uses IAT data to calculate optimal fuel delivery and ignition timing, so an inaccurate reading can significantly impact engine performance and efficiency.
How serious is this code?
While P0113 typically doesn't pose an immediate safety hazard that would prevent driving, it can lead to significant drivability issues. These may include reduced engine performance, poor fuel economy, increased exhaust emissions, rough idling, or hesitation during acceleration. Prolonged driving with an incorrect IAT reading can also potentially lead to catalytic converter damage due to an overly rich fuel mixture. It is advisable to diagnose and repair this issue promptly to restore optimal engine operation and prevent further complications.
Most Common Causes for Audi A3
- Faulty Intake Air Temperature (IAT) sensor
- Damaged, chafed, or broken wiring harness
- Corroded or loose electrical connector
Symptoms to Watch For
- Check Engine Light is illuminated
- Decreased fuel economy
- Difficulty starting the engine
- Rough or unstable idle
Before replacing parts, check these first
- Check for blown fuses related to the circuit.
- Inspect the wiring harness and electrical connectors for visible damage or corrosion.
- Verify the 12V battery is fully charged, as low voltage can trigger false codes.
- Look for obvious vacuum leaks or cracked hoses under the hood.
How to Diagnose
Common Mistakes
A very common mistake when diagnosing the P0113 code is automatically replacing the sensor or component mentioned in the code description without first testing it. Electrical issues, wiring damage, or vacuum leaks are frequently the true cause. Always use a multimeter and live data scanner to verify component failure before spending money on parts.
Frequently Asked Questions
Can I drive with the P0113 code?
If the check engine light is solid, you can usually drive to a safe location or mechanic. If the light is flashing, pull over immediately to prevent catastrophic engine or catalytic converter damage.
Will the P0113 code clear itself?
Once the underlying problem is fixed, the engine computer will run its self-checks. If it passes over several drive cycles, the light will turn off automatically. You can also clear it immediately using an OBD2 scanner.
Will this code fail an emissions test?
Yes. If the Check Engine Light is on due to the P0113 code, your Audi will automatically fail an OBD2 plug-in emissions or smog test.
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Repair Estimate
DIY Difficulty
Can usually be performed at home with basic hand tools.