Quick answer: The P0113 code indicates that the Engine Control Module detects an abnormally high voltage signal from the Intake Air Temperature sensor. This affects the engine’s air-fuel mixing system. While not an immediate safety hazard, it should be resolved quickly to prevent poor fuel economy and rough idling.
Seeing a check engine light on your dashboard can be unsettling, especially when an OBD-II scanner points to code P0113. This specific code indicates that your vehicle’s computer is having trouble reading the temperature of the air entering the engine. In this guide, we will break down what this code means, the symptoms to watch for, and how you can diagnose and fix the issue.
What Does P0113 Mean?
The P0113 code stands for “Intake Air Temperature Sensor 1 Circuit High Input.” Your engine’s computer relies on the Intake Air Temperature sensor to determine the density of the incoming air. Cold air is dense and requires more fuel, while warm air is less dense and requires less fuel. The sensor uses a thermistor that changes resistance based on temperature, sending a corresponding voltage signal back to the computer.
When the computer detects a voltage signal that is higher than the normal operating range, it triggers the P0113 code. A high voltage signal typically indicates an open circuit or an extremely cold temperature reading (often below -40 degrees). To keep the engine running, the computer will usually ignore the sensor and use a pre-programmed backup value, which can affect engine efficiency.
Symptoms
- The check engine light stays illuminated on the dashboard.
- Difficulty starting the engine, especially during cold mornings.
- A noticeable drop in fuel mileage.
- Rough idling or engine hesitation when accelerating.
- Engine pinging or knocking under heavy loads.
Possible Causes
Before buying new parts, keep in mind that a faulty sensor is not always the culprit; simple wiring issues are incredibly common and much cheaper to repair.
- A loose, dirty, or corroded connector at the sensor.
- Broken, frayed, or shorted wires in the sensor circuit.
- A defective Intake Air Temperature sensor.
- A dirty air filter housing that restricts proper airflow around the sensor.
- A malfunctioning Engine Control Module, though this is very rare.
Check These Yourself Before Visiting a Mechanic
- Inspect the connector: Locate the sensor along your air intake tube. Unplug the connector and look inside for green corrosion, bent pins, or dirt. Push it back in until you hear a firm click.
- Look for wire damage: Trace the wires leading away from the sensor. Look for signs of chewing by rodents, melting from engine heat, or spots where the insulation has rubbed off against metal parts.
- Clean the sensor: If the sensor is integrated into your Mass Air Flow sensor, use a dedicated spray cleaner to gently remove any oily film or dirt buildup from the sensing element.
How to Fix It
- Perform a thorough visual inspection of the sensor, connector, and wiring harness, repairing any visible damage first.
- Use an OBD-II scanner to view live data. If the temperature reading is stuck at an extremely low value, unplug the sensor and use a jumper wire to bridge the terminals; if the reading jumps to a high temperature, the wiring is good and the sensor is bad.
- Test the sensor’s resistance using a digital multimeter and compare the reading to the manufacturer’s specifications for the current outdoor temperature.
- Replace the sensor if it fails the resistance test or does not respond to temperature changes.
- Clear the trouble codes and take the vehicle for a test drive to ensure the code does not return.
Estimated Repair Costs (2026)
| Job | Parts ($) | Labor ($) |
|---|---|---|
| Wiring or Connector Repair | $15 – $40 | $60 – $120 |
| Sensor Cleaning | $10 – $15 | $0 – $50 |
| Sensor Replacement | $30 – $90 | $50 – $100 |
| Mass Air Flow Assembly Replacement | $90 – $250 | $60 – $120 |
Note: these are 2026 estimates in US dollars; costs vary by make and model.
Frequently Asked Questions
Can I drive with the P0113 code?
Yes, you can generally drive with this code for a short period. The vehicle’s computer will use a default temperature setting to keep the engine running. However, you may experience decreased fuel economy, poor throttle response, and rough starting, so it is best to address the issue soon.
How do I clear the P0113 code?
Once you have diagnosed and fixed the physical issue, you can clear the code using an OBD-II scan tool. Alternatively, the computer may clear the code on its own after you complete a few normal driving cycles without the fault reoccurring.
Where is the Intake Air Temperature sensor located?
In most modern vehicles, the sensor is built directly into the Mass Air Flow sensor housing, which is located on the plastic intake tube between the air filter box and the engine. On some older vehicles, it may be a separate, smaller sensor threaded directly into the intake manifold.