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Summary
  • Diagnostic trouble code (DTC) P0111 stands for “Intake Air Temperature Sensor 1 Circuit Range/Performance (Bank 1).” This means the powertrain control module (PCM) perceives the signal from the intake air temperature (IAT) sensor to be outside factory specifications.
  • Common causes of the P0111 code include a faulty IAT sensor, a bad mass air flow sensor, circuit or wiring issues, and a failed PCM.
  • The symptoms that often accompany the P0111 code include an active check engine light, bad fuel mileage, and poor engine performance.

On-board diagnostic (OBD) codes are designed to help you or your mechanic identify possible issues in your car. They can be retrieved with a scan tool, though knowing what they mean is another thing. Before attempting any fixes to resolve them, you should first understand the meaning, triggers, and symptoms of the logged code.

What Does the P0111 Code Mean?

Diagnostic trouble code (DTC) P0111 stands for “Intake Air Temperature Sensor 1 Circuit Range/Performance (Bank 1).” This error code is logged when the powertrain control module (PCM) perceives the signal from the intake air temperature (IAT) sensor to be outside factory specifications. Usually, the PCM determines this by comparing the IAT signal to the signal from the engine coolant temperature (ECT) sensor.

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IAT Sensor Black
The code P0111 is logged when the powertrain control module (PCM) perceives the signal from the intake air temperature (IAT) sensor to be outside factory specifications.

The sensor 1 portion of the code applies to vehicles that have multiple IAT sensors. Bank 1 points to the side of the engine opposite the #1 cylinder.

The IAT sensor is a thermistor. Its resistance decreases as its temperature increases. As the temperature rises, the sensor becomes more electrically conductive. It is usually a two-wire sensor that has one wire supplying voltage to the PCM, while the other is a ground.

So when the intake air is cold, it means both the resistance and signal voltage are high. And if the air is warm, then both the resistance and signal voltage is low. The trouble code is set once the PCM detects erratic behavior from the IAT sensor. One example is when there is a huge difference between signals on the IAT signal circuit in a short amount of time.

This error code can also be logged when the PCM recognizes that the signal from the IAT has exceeded the appropriate range when compared to the signal from the ECT sensor.

For more information, read our advanced technical discussion about the IAT sensor and how it can trigger codes like P0111 to appear on a scan tool.

Note: The definition of code P0111 may be different depending on the vehicle manufacturer. Consult the appropriate repair manual or repair database for the exact code definition.

What are the Possible Causes of the P0111 Code?

P0111 is a generic code, so it can have several triggers. Here are the most common:

See also  P0102 Code: Mass Air Flow (MAF) Circuit Low

What are the Common Symptoms of the P0111 Code?

You may notice the following symptoms if you drive a car that has a logged P0111 error code:

How to Diagnose the P0111 Code

Code P0111 should be resolved immediately to avoid complications. However, diagnosing it can be difficult as it has many possible triggers. To make sure you’re on the right path, the diagnostic and repair steps should always depend on the specifications of your vehicle.

man gets obd code after auto inspection
Code P0111 should be resolved immediately to avoid complications.

Because all cars are built differently, they would also require different diagnoses. A P0111 on a Honda Fit, for instance, may require an entirely different testing process from a P0111 on a Dodge Ram. Refer to a repair manual specific to your vehicle for the appropriate diagnostic steps.

But if you feel like your automotive know-how is lacking, it would be best to let a mechanic troubleshoot this error code instead.

How to Fix the P0111 Code

Code P0111 may be set in vehicles of varying makes and models. It may also share similar triggers and symptoms with other DTCs. There is no one-size-fits-all solution for this code, as different manufacturers require varying solutions.

Always refer to the factory repair information specific to your car before DIY-ing any repairs. But if you aren’t confident in your automotive repair skills, it may be wise to leave the diagnosis and repair to the experts.

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Getting a Replacement MAF Sensor for Your Vehicle

As a responsible car owner, you should never ignore a P0111 error code. Doing so can result in bad fuel mileage and poor engine performance, both of which can negatively affect your vehicle’s driveability. For your own sake, it’s best to replace the faulty MAF sensor that’s likely triggering the P0111 code. Luckily, at CarParts.com, you can get a new MAF sensor with just a few clicks.

Ordering a replacement MAF sensor that fits your vehicle has never been easier, thanks to our easy-to-navigate website. Enjoy a hassle-free shopping experience by entering your vehicle’s year, make, and model in our built-in vehicle selector, so you can see all the parts that are compatible with your ride. Our convenient and secure checkout also makes paying for your order easy and secure.

Don’t wait until your faulty MAF sensor damages other parts of your engine before replacing it. Check out our excellent selection of mass air flow sensors at CarParts.com, and order today!

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About The Authors
Written By Automotive and Tech Writers

The CarParts.com Research Team is composed of experienced automotive and tech writers working with (ASE)-certified automobile technicians and automotive journalists to bring up-to-date, helpful information to car owners in the US. Guided by CarParts.com's thorough editorial process, our team strives to produce guides and resources DIYers and casual car owners can trust.

Reviewed By Technical Reviewer at CarParts.com

Richard McCuistian has worked for nearly 50 years in the automotive field as a professional technician, an instructor, and a freelance automotive writer for Motor Age, ACtion magazine, Power Stroke Registry, and others. Richard is ASE certified for more than 30 years in 10 categories, including L1 Advanced Engine Performance and Light Vehicle Diesel.

Any information provided on this Website is for informational purposes only and is not intended to replace consultation with a professional mechanic. The accuracy and timeliness of the information may change from the time of publication.

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