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P0112 2009 Ford Fusion Code - Intake Air Temperature Sensor Circuit Low Input

Quick Answer

The P0112 diagnostic trouble code (DTC) for a 2009 Ford Fusion indicates a problem with the Intake Air Temperature (IAT) Sensor Circuit, specifically a low input signal. Common causes include Faulty Intake Air Temperature (IAT) sensor, Damaged wiring or connectors in the sensor circuit, Corrosion or poor connection at the sensor terminals. 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 2009 Ford Fusion indicates Intake Air Temperature Sensor Circuit Low Input.
Common causes
Common causes include Faulty Intake Air Temperature (IAT) sensor, Damaged wiring or connectors in the sensor circuit, Corrosion or poor connection at the sensor terminals.
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 14, 2024
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Code P0112 2009 Ford Fusion Description

The P0112 diagnostic trouble code (DTC) for a 2009 Ford Fusion indicates a problem with the Intake Air Temperature (IAT) Sensor Circuit, specifically a low input signal. The IAT sensor is responsible for measuring the temperature of the air entering the engine. This information is crucial for the engine control module (ECM) to adjust the air-fuel mixture for optimal combustion. When the ECM detects a low input signal from the IAT sensor, it may cause various issues with the engine's performance.

OBDII Code P0112 2009 Ford Fusion - Intake Air Temperature Sensor Circuit Low Input
P0112 2009 Ford Fusion Code - Intake Air Temperature Sensor Circuit Low Input

Common Causes of P0112 2009 Ford Fusion

  1. Faulty Intake Air Temperature (IAT) sensor
  2. Damaged wiring or connectors in the sensor circuit
  3. Corrosion or poor connection at the sensor terminals
  4. ECM malfunction
  5. Intake air leaks near the sensor

Symptoms of P0112 2009 Ford Fusion

  1. Decreased fuel efficiency
  2. Rough idling
  3. Hesitation during acceleration
  4. Engine stalling
  5. Increased emissions

How to Fix P0112 2009 Ford Fusion

  1. Begin by locating the IAT sensor, usually located near the air intake duct or air filter housing.
  2. Inspect the wiring and connectors for any visible damage or corrosion. Repair or replace as necessary.
  3. Test the IAT sensor using a multimeter to check for proper resistance values. Replace the sensor if it is out of specification.
  4. Clear the DTC using an OBD-II scanner and monitor the sensor's readings to ensure the issue has been resolved.
  5. If the problem persists, further diagnosis may be required to identify any underlying issues with the ECM or other components.

Cost to Fix P0112 2009 Ford Fusion

The typical repair costs for addressing a P0112 code on a 2009 Ford Fusion can vary depending on the specific cause of the issue. Replacement of the IAT sensor itself can range from $50 to $100, while labor costs can add another $50 to $100. If additional diagnosis or repairs are needed, the total cost could increase. It's important to consider the specific diagnosis time and labor rates at auto repair shops, which can vary based on location, vehicle make and model, and engine type. It's advisable to check with local shops for a more accurate estimate.

What does this mean?

Tech Notes for P0112 2009 Ford Fusion

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 2009 Ford Fusion Code

1. What are the common symptoms of OBDII code P0112 on a 2009 Ford Fusion?

- Common symptoms include poor fuel economy, rough idling, engine stalling, and a decrease in overall engine performance.

2. What does the OBDII code P0112 indicate on a 2009 Ford Fusion?

- The code P0112 indicates a low input signal from the Intake Air Temperature (IAT) sensor circuit.

3. What are the possible causes of the Intake Air Temperature Sensor Circuit Low Input code (P0112) on a 2009 Ford Fusion?

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

4. How can I diagnose the cause of the P0112 code on my 2009 Ford Fusion?

- To diagnose the issue, you can use a multimeter to test the IAT sensor's resistance, check for any wiring or connector damage, and scan the ECM for any related trouble codes.

5. Can I drive my 2009 Ford Fusion with the P0112 code present?

- It is not recommended to drive your vehicle with the P0112 code, as it can lead to poor engine performance and potential damage if left unresolved.

6. How can I repair the Intake Air Temperature Sensor Circuit Low Input code (P0112) on my 2009 Ford Fusion?

- Repair options include replacing the IAT sensor, repairing any damaged wiring or connectors, and resetting the ECM to clear the trouble code.

7. Will resetting the ECM clear the P0112 code on my 2009 Ford Fusion?

- Resetting the ECM may temporarily clear the code, but if the underlying issue causing the P0112 code persists, the code is likely to return.

8. How much does it typically cost to repair the P0112 code on a 2009 Ford Fusion?

- The cost of repairing the P0112 code can vary depending on the cause of the issue, but it may range from $50 to $200 for parts and labor.

9. Can a DIY enthusiast fix the P0112 code on a 2009 Ford Fusion?

- Yes, a knowledgeable DIY enthusiast with the right tools and experience can potentially diagnose and repair the P0112 code on a 2009 Ford Fusion.

10. How important is it to address the P0112 code promptly on a 2009 Ford Fusion?

- It is important to address the P0112 code promptly to prevent further engine damage, ensure optimal fuel efficiency, and maintain overall vehicle performance.

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