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P0113 Fault Code: What It Means and How to Fix It

The P0113 fault code indicates a problem with the intake air temperature (IAT) sensor circuit. I’m John Cunningham, a qualified mechanic, and in this blog post, we’ll explain what P0113 is, its symptoms, its causes, how to diagnose it, and common fixes.

We’ll cover the following:

What is P0113?

P0113 is an OBD-II fault code that indicates a problem with the intake air temperature (IAT) sensor circuit. The IAT sensor is a thermistor that measures the temperature of the air entering the engine. This information is used by the engine control module (ECM) to adjust the fuel injection and ignition timing. When the ECM detects a problem with the IAT sensor circuit, it sets the P0113 code.

P0113 Symptoms

Here are the most common symptoms of P0113:

  1. Check Engine Light (CEL) is on
  2. Decreased fuel efficiency
  3. Rough idling or stalling
  4. Engine misfires or hesitations
  5. Reduced engine performance
  6. Failed emissions test
  7. Engine overheating

If you experience any of these symptoms, it’s essential to investigate it asap.

What causes P0113?

The following are the most common causes of P0113:

  1. Faulty IAT sensor
  2. Damaged or corroded wiring in the IAT sensor circuit
  3. Failed Mass Air Flow (MAF) sensor
  4. A loose or damaged connector in the IAT sensor circuit
  5. Failed engine coolant temperature (ECT) sensor
  6. Vacuum leaks in the intake system

How to diagnose P0113?

To diagnose P0113, you need an OBD-II scanner to retrieve the code from the ECM. You can use a multimeter to test the resistance of the IAT sensor and check for continuity in the wiring and connectors. If the IAT sensor and wiring are in good condition, you should test the ECT and MAF sensors.


I’ve covered IAT testing previously in this post – “Intake Air Temperature (IAT) sensor testing.”

Common fix for P0113.

The most common fix for P0113 is to replace the faulty IAT sensor. If the wiring and connectors are damaged or corroded, they may need to be repaired or replaced. IAT is commonly MAF sensor integrated, so replacing the whole unit is more typical.

Sum Up

P0113 is a fault code that indicates a problem with the IAT sensor circuit. If you experience any of the symptoms listed above, it’s essential to have your vehicle checked asap.

About the Author

This article was created with the assistance of AI technology to aid the author, John Cunningham, who is a seasoned Red Seal-certified auto technician with more than 25 years of experience in vehicle repairs. John Cunningham has edited the content to ensure accuracy and quality.

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