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P1112 2003 Ford F150 Code - Intake Air Temperature Sensor Intermittent

Quick Answer

The P1112 code for a 2003 Ford F150 is indicating an issue with the Intake Air Temperature Sensor being intermittent. Common causes include Loose or corroded electrical connections to the Intake Air Temperature Sensor, Damaged wiring or harness leading to the sensor, Faulty Intake Air Temperature Sensor. 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
P1112 2003 Ford F150 indicates Intake Air Temperature Sensor Intermittent .
Common causes
Common causes include Loose or corroded electrical connections to the Intake Air Temperature Sensor, Damaged wiring or harness leading to the sensor, Faulty Intake Air Temperature Sensor.
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 09, 2024
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Code P1112 2003 Ford F150 Description

The P1112 code for a 2003 Ford F150 is indicating an issue with the Intake Air Temperature Sensor being intermittent. The Intake Air Temperature Sensor (IAT) is a crucial component of the engine's air intake system, responsible for measuring the temperature of the incoming air. This data is used by the engine control module (ECM) to adjust the air-fuel mixture for optimal combustion and performance. An intermittent fault with the IAT sensor can lead to inaccurate temperature readings, which can negatively impact the engine's performance and fuel efficiency.

OBDII Code P1112 2003 Ford F150 - Intake Air Temperature Sensor Intermittent
P1112 2003 Ford F150 Code - Intake Air Temperature Sensor Intermittent

Common Causes of P1112 2003 Ford F150

  1. Loose or corroded electrical connections to the Intake Air Temperature Sensor
  2. Damaged wiring or harness leading to the sensor
  3. Faulty Intake Air Temperature Sensor
  4. Contamination or debris affecting the sensor's functionality
  5. Issues with the ECM or related control modules

Symptoms of P1112 2003 Ford F150

  1. Check Engine Light illuminated on the dashboard
  2. Rough idling or erratic engine performance
  3. Reduced fuel efficiency
  4. Stalling or hesitation during acceleration
  5. Increased emissions or failing emissions test

How to Fix P1112 2003 Ford F150

  1. Begin by locating the Intake Air Temperature Sensor in the air intake system.
  2. Inspect the sensor and its wiring for any visible damage or corrosion.
  3. Test the sensor's resistance and voltage output using a multimeter to determine if it is faulty.
  4. If the sensor is faulty, replace it with a new OEM or aftermarket sensor.
  5. Clear the diagnostic trouble codes from the ECM using a scan tool and test drive the vehicle to ensure the issue has been resolved.

Cost to Fix P1112 2003 Ford F150

The typical repair costs for addressing a P1112 code on a 2003 Ford F150 can range from $100 to $300, including parts and labor. However, it is important to note that the specific diagnosis time and labor rates at auto repair shops can vary based on factors such as location, vehicle make and model, and engine type. It is recommended to check with local repair shops to obtain a more accurate estimate based on your specific circumstances.

What does this mean?

Tech Notes for P1112 2003 Ford F150

Before replacing the mass air flow sensor, try replacing the air filter and cleaning the air flow sensor with mass air flow sensor cleaner. Reset code and drive vehicle. If the code comes back, it may be necessary to replaced the mass air flow sensor. Monitor the IAT on a scan tool. Look for sudden changes in the reading when the harness is wiggled or the sensor is tapped.

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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 P1112 2003 Ford F150 Code

1. What does the OBDII code P1112 mean on a 2003 Ford F150?

P1112 indicates an "Intake Air Temperature Sensor Intermittent" issue, meaning the sensor is sending inconsistent readings to the engine control module (ECM).

2. What are the symptoms of code P1112 on a 2003 Ford F150?

Common symptoms include poor fuel economy, rough idling, hesitation during acceleration, and the check engine light being illuminated.

3. What causes the P1112 code on a 2003 Ford F150?

Possible causes include a faulty intake air temperature (IAT) sensor, damaged wiring or connectors, corrosion in the electrical circuit, or a failing engine control module (ECM).

4. How do I diagnose the P1112 code on my 2003 Ford F150?

Start by inspecting the IAT sensor and its wiring for damage or corrosion. Use a multimeter to test the sensor's resistance and confirm it changes with temperature. Check for proper voltage at the connector.

5. Can a dirty air filter cause the P1112 code on a 2003 Ford F150?

A dirty air filter is unlikely to directly cause the P1112 code, but it can affect overall engine performance and airflow, which might exacerbate related issues.

6. How do I fix the P1112 code on my 2003 Ford F150?

Repair or replace the intake air temperature sensor if faulty. Fix any damaged wiring or connectors, and clear the code with a scan tool after repairs are completed.

7. Can I drive my 2003 Ford F150 with the P1112 code?

While the truck may still be drivable, it could experience poor performance or fuel efficiency. Prolonged driving without repair could lead to further engine issues.

8. How much does it cost to fix the P1112 code on a 2003 Ford F150?

Replacing the intake air temperature sensor typically costs $50-$150, depending on parts and labor. Wiring repairs may add to the cost if needed.

9. Where is the intake air temperature sensor located on a 2003 Ford F150?

The IAT sensor is usually located on or near the air intake tube between the air filter box and the throttle body.

10. Can a faulty mass air flow sensor trigger the P1112 code on a 2003 Ford F150?

While the mass air flow (MAF) sensor is separate, issues with the MAF sensor could cause related airflow problems. However, the P1112 code specifically points to the IAT sensor or its circuit.

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