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P0112 2003 Ford F150 Code - Intake Air Temperature Sensor Circuit Low Input

Quick Answer

The P0112 diagnostic trouble code (DTC) for a 2003 Ford F150 indicates that there is a low input signal from the intake air temperature (IAT) sensor circuit. Common causes include Faulty IAT sensor: The sensor itself may be malfunctioning, providing incorrect readings to the ECM, Wiring issues: Damaged or corroded wiring connections to the IAT sensor can disrupt the signal, Poor electrical connection: Loose or poor electrical connections can cause the ECM to receive incorrect signals. 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
P0112 2003 Ford F150 indicates Intake Air Temperature Sensor Circuit Low Input.
Common causes
Common causes include Faulty IAT sensor: The sensor itself may be malfunctioning, providing incorrect readings to the ECM, Wiring issues: Damaged or corroded wiring connections to the IAT sensor can disrupt the signal, Poor electrical connection: Loose or poor electrical connections can cause the ECM to receive incorrect signals.
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 Aug 30, 2024
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Code P0112 2003 Ford F150 Description

The P0112 diagnostic trouble code (DTC) for a 2003 Ford F150 indicates that there is a low input signal from the intake air temperature (IAT) sensor circuit. The IAT sensor plays a crucial role in monitoring the temperature of the air entering the engine. This information is essential for the engine control module (ECM) to adjust the air-fuel mixture and ignition timing for optimal performance and efficiency. When the ECM detects a low input signal from the IAT sensor, it can negatively impact the vehicle's performance, fuel efficiency, and emissions.

OBDII Code P0112 2003 Ford F150 - Intake Air Temperature Sensor Circuit Low Input
P0112 2003 Ford F150 Code - Intake Air Temperature Sensor Circuit Low Input

Common Causes of P0112 2003 Ford F150

  1. Faulty IAT sensor: The sensor itself may be malfunctioning, providing incorrect readings to the ECM.
  2. Wiring issues: Damaged or corroded wiring connections to the IAT sensor can disrupt the signal.
  3. Poor electrical connection: Loose or poor electrical connections can cause the ECM to receive incorrect signals.
  4. Intake air leaks: Air leaks in the intake system can affect the IAT sensor readings, triggering the P0112 code.

Symptoms of P0112 2003 Ford F150

  1. Decreased fuel efficiency: A malfunctioning IAT sensor can cause the ECM to supply an incorrect amount of fuel, leading to poor fuel economy.
  2. Engine misfires: Incorrect air-fuel mixture due to a faulty IAT sensor can result in engine misfires and rough idling.
  3. Check Engine Light: The illumination of the Check Engine Light is a common symptom of a faulty IAT sensor.
  4. Engine hesitation: The engine may hesitate or exhibit a lack of power when accelerating if the IAT sensor is not functioning properly.

How to Fix P0112 2003 Ford F150

  1. Diagnose the issue: Use a multimeter to test the IAT sensor and its wiring for proper functionality.
  2. Replace the IAT sensor: If the sensor is faulty, replace it with a new one to ensure accurate temperature readings.
  3. Check wiring connections: Inspect and repair any damaged or corroded wiring connections to the sensor.
  4. Clear the DTC: After repairing the issue, clear the DTC using an OBD-II scanner to reset the Check Engine Light and monitor for any recurrence.

Cost to Fix P0112 2003 Ford F150

The cost estimate for resolving a P0112 code on a 2003 Ford F150 can vary depending on the specific cause of the issue and the labor rates in your area. On average, replacing an IAT sensor can cost between $50 and $150 for the part alone. Labor costs can range from $80 to $150 per hour, with the total repair cost likely falling between $150 and $300. It's recommended to consult with a local auto repair shop for a more accurate estimate based on your vehicle's needs.

What does this mean?

Tech Notes for P0112 2003 Ford F150

Before replacing the Mass Air Flow (MAF) sensor, try replacing the air filter and cleaning the Mass Air Flow sensor with Mass Air Flow sensor cleaner. Reset code and drive the vehicle. If the code comes back, it may be necessary to replace the Mass Air Flow sensor.

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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 P0112 2003 Ford F150 Code

1. What are the common symptoms of OBDII code P0112 on a 2003 Ford F150?

The common symptoms include poor engine performance, rough idling, decreased fuel efficiency, and in some cases, the Check Engine light may illuminate.

2. What does the OBDII code P0112 indicate in a 2003 Ford F150?

The code P0112 indicates that the Intake Air Temperature (IAT) sensor circuit is registering a low input signal.

3. What are the possible causes of the Intake Air Temperature Sensor Circuit Low Input code on a 2003 Ford F150?

Possible causes include a faulty IAT sensor, damaged wiring or connectors in the sensor circuit, or issues with the Engine Control Module (ECM).

4. How can I diagnose the cause of the P0112 code on my 2003 Ford F150?

Diagnose the code by inspecting the IAT sensor and its wiring for any visible damage, testing the sensor's resistance, and checking the ECM for any faults using a diagnostic tool.

5. Can I drive my 2003 Ford F150 with the P0112 code?

It is not recommended to drive with the P0112 code as it can lead to further engine issues and reduced performance. It is best to address the issue promptly.

6. Is it possible to reset the P0112 code on a 2003 Ford F150?

Yes, you can reset the code using an OBDII scanner. However, it is essential to address the underlying issue causing the code to prevent it from reoccurring.

7. How do I repair the Intake Air Temperature Sensor Circuit Low Input code on my 2003 Ford F150?

Repair options include replacing the faulty IAT sensor, repairing damaged wiring or connectors, or reprogramming the ECM if needed.

8. Can a dirty air filter trigger the P0112 code on a 2003 Ford F150?

A dirty air filter can indirectly affect the IAT sensor readings but is not a direct cause of the P0112 code. It is still essential to replace a dirty air filter for optimal engine performance.

9. How much does it typically cost to repair the P0112 code on a 2003 Ford F150?

The repair cost can vary depending on the cause of the issue. Replacing the IAT sensor can cost around $50-$100, while addressing wiring or ECM issues may incur additional labor costs.

10. Will the P0112 code on a 2003 Ford F150 affect the vehicle's emissions?

Yes, the P0112 code can impact the vehicle's emissions by causing inefficient fuel combustion, potentially leading to increased emissions output. It is crucial to address the issue promptly to maintain emissions compliance.

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