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.
Here are the most common symptoms of P0113:
- Check Engine Light (CEL) is on
- Decreased fuel efficiency
- Rough idling or stalling
- Engine misfires or hesitations
- Reduced engine performance
- Failed emissions test
- 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:
- Faulty IAT sensor
- Damaged or corroded wiring in the IAT sensor circuit
- Failed Mass Air Flow (MAF) sensor
- A loose or damaged connector in the IAT sensor circuit
- Failed engine coolant temperature (ECT) sensor
- 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.
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.
You may find the following links helpful:
- How to use a fault code reader (video)
- Fault code reader I recommend for DIYers
- Fault code index page
- Beginner DIY maintenance page
- DIY troubleshooting and repair page
- Recommended mechanics tools
- Are OBD scanners universal?
- OBD won’t connect
- OBD won’t clear codes
- OBD scanner won’t turn on
- About the Author
- Latest Posts
John Cunningham is an Automotive Technician and writer on Rustyautos.com. He’s been a mechanic for over twenty-five years and has worked for GM, Volvo, Volkswagen, Land Rover, and Jaguar dealerships.
John uses his know-how and experience to write fluff-free articles that help fellow gearheads with all aspects of vehicle ownership, including maintenance, repair, and troubleshooting.