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P0111 Ford Code - Intake Air Temperature Sensor 1 Circuit Range/Performance Problem

Quick Answer

The Intake Air Temperature (IAT) Sensor is a thermistor device in which resistance changes with temperature. Common causes include Faulty Intake Air Temperature (IAT) Sensor, Intake Air Temperature Sensor harness is open or shorted, Intake Air Temperature Sensor circuit poor electrical connection. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means
P0111 Ford indicates Intake Air Temperature Sensor 1 Circuit Range/Performance Problem.
Common causes
Common causes include Faulty Intake Air Temperature (IAT) Sensor, Intake Air Temperature Sensor harness is open or shorted, Intake Air Temperature Sensor circuit poor electrical connection.
Severity
High - diagnose this code as soon as possible.
Can I drive?
Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
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Code Popularity 42,219
How popular is this code, among other codes? Medium
What is this?
Table of contents Created and updated by William Orellana on Sep 22, 2023
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Code P0111 Ford Description

The Intake Air Temperature (IAT) Sensor is a thermistor device in which resistance changes with temperature. The resistance of a thermistor decreases as the temperature increases, and the resistance increases as the temperature decreases. The varying resistance affects the voltage drop across the sensor pins and provides electrical signals to the Powertrain Control Module (PCM) corresponding to temperature.
Thermistor-type sensors are considered passive sensors. A passive sensor is connected to a voltage divider network so that varying the resistance of the passive sensor causes a variation in total current flow. The voltage that is dropped across a fixed resistor in a series with the sensor resistor determines the voltage signal at the PCM. This voltage signal is equal to the reference voltage minus the voltage drop across the fixed resistor.
The IAT sensor provides air temperature information to the PCM. The PCM uses the air temperature information as a correction factor in the calculation of fuel, spark, and airflow.
The IAT sensor provides a quicker temperature change response time than the Engine Coolant Temperature (ECT) or Cylinder Head Temperature (CHT) sensor.
Currently, there are 2 types of IAT sensors used, a stand-alone and an integrated type. Both types function the same, however, the integrated type is incorporated into the Mass Air Flow (MAF) Sensor, the Manifold Absolute Pressure and Temperature (MAPT) Sensor, or the Turbocharger Intake Pressure and Temperature (TCIPT) Sensor instead of being a stand-alone sensor.
This Diagnostic Trouble Code (DTC) will be set if the IAT Sensor value exceeds the maximum calibrated temperature threshold while driving.
OBDII Code P0111 Ford - Intake Air Temperature Sensor 1 Circuit Range/Performance Problem - AutoCodes.com
P0111 Ford Code - Intake Air Temperature Sensor 1 Circuit Range/Performance Problem
What does this mean?

What are the Possible Causes of the DTC P0111 Ford?

  • Faulty Intake Air Temperature (IAT) Sensor
  • Intake Air Temperature Sensor harness is open or shorted
  • Intake Air Temperature Sensor circuit poor electrical connection

How to Fix the DTC P0111 Ford?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0111 Ford code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

Need more information about the P0111 Ford code?

Need more information on how to fix the P0111 Ford code? Get Access to Factory Service Manuals

Need Help with the Code?

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Information for Specific Ford Models

About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about P0111 Ford Code

1. What are common symptoms of OBDII code P0111 in a Ford vehicle?

- Common symptoms include poor engine performance, rough idling, decreased fuel efficiency, and potential stalling.

2. What does the OBDII code P0111 in a Ford indicate?

- This code indicates a problem with the Intake Air Temperature Sensor 1 circuit, specifically related to range/performance issues.

3. What are possible causes of the Intake Air Temperature Sensor 1 Circuit Range/Performance Problem in a Ford?

- Possible causes include a faulty intake air temperature sensor, damaged wiring or connectors, a dirty air filter, or issues with the sensor's calibration.

4. How can I diagnose the cause of the Intake Air Temperature Sensor 1 Circuit Range/Performance Problem in my Ford?

- You can use a multimeter to test the intake air temperature sensor for proper resistance values, visually inspect the sensor and its connections for damage, and check the air filter for cleanliness and blockages.

5. Is it safe to continue driving my Ford with the P0111 code present?

- It is not recommended to drive your vehicle with the P0111 code present, as it can lead to further engine damage and potential safety hazards.

6. Can I repair the Intake Air Temperature Sensor 1 Circuit Range/Performance Problem in my Ford myself?

- Depending on your skill level, you may be able to replace the intake air temperature sensor yourself, but it is recommended to have a professional diagnose and repair the issue to ensure proper functionality.

7. Will resetting the OBDII code P0111 in my Ford make the problem go away?

- Resetting the code may temporarily turn off the check engine light, but it will not fix the underlying issue causing the Intake Air Temperature Sensor 1 Circuit Range/Performance Problem.

8. How much does it typically cost to repair the P0111 code in a Ford at a mechanic or dealership?

- The cost of repairing the P0111 code can vary depending on the exact cause of the issue, but it may range from $100 to $300 for parts and labor.

9. Can a malfunctioning Intake Air Temperature Sensor affect other systems in my Ford vehicle?

- Yes, a malfunctioning sensor can affect the engine's air-fuel mixture, ignition timing, and overall performance, potentially leading to a decrease in fuel efficiency and increased emissions.

10. How often should the Intake Air Temperature Sensor be inspected or replaced in a Ford vehicle?

- It is recommended to inspect the intake air temperature sensor during regular maintenance intervals and replace it if any issues are detected or if it fails diagnostic tests.

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