AutoCodes – Ford – P0127 2009 Ford Fusion

P0127 2009 Ford Fusion Code - Intake Air Temperature 2 Sensor Too High

Quick Answer

The Intake Air Temperature (IAT) sensor is built into Mass Air Flow (MAF) sensor. Common causes include Dirty Air Filter, Faulty Intake Air Temperature (IAT) Sensor, Intake Air Temperature Sensor harness is open or shorted. 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: P0127 2009 Ford Fusion indicates Intake Air Temperature 2 Sensor Too High.
Common causes: Common causes include Dirty Air Filter, Faulty Intake Air Temperature (IAT) Sensor, Intake Air Temperature Sensor harness is open or shorted.
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 2,093

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Intermediate (2 / 3)

What is this?

Table of contents Created and updated by William Orellana on Jul 13, 2020

Description
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code P0127 2009 Ford Fusion Description

The Intake Air Temperature (IAT) sensor is built into Mass Air Flow (MAF) sensor. The sensor detects intake air temperature and transmits a signal to the Powertrain Control Module (PCM). The temperature sensing unit uses a thermistor which is sensitive to the change in temperature. The electrical resistance of the thermistor decreases in response to the temperature rise. The Intake Air Temperature signal is used as an input for various systems in the vehicle. It is used by the Powertrain Control Module to assist with the calculation of idle speed, fuel mixture, and spark advance. The Diagnostic Trouble Code (DTC) will set when the PCM detects an excessively high voltage from the sensor.

OBDII Code P0127 2009 Ford Fusion - Intake Air Temperature 2 Sensor Too High - AutoCodes.com — P0127 2009 Ford Fusion Code - Intake Air Temperature 2 Sensor Too High

What does this mean?

What are the Possible Causes of the DTC P0127 2009 Ford Fusion?

Dirty Air Filter
Faulty Intake Air Temperature (IAT) Sensor
Intake Air Temperature Sensor harness is open or shorted
Intake Air Temperature Sensor circuit poor electrical connection
Faulty Powertrain Control Module (PCM)

How to Fix the DTC P0127 2009 Ford Fusion?

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 does this mean?

Code Tech Notes

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.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0127 2009 Ford Fusion 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 P0127 2009 Ford Fusion code?

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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 P0127 2009 Ford Fusion Code

What does the OBDII code P0127 mean on a 2009 Ford Fusion?

The P0127 code on a 2009 Ford Fusion indicates that the Intake Air Temperature (IAT) sensor 2 is reporting a temperature that is higher than the expected range, suggesting the air entering the engine is too hot.

What are common symptoms of code P0127 in a 2009 Ford Fusion?

Symptoms can include a check engine light, reduced engine performance, possible engine overheating, and poor fuel economy.

What can cause the P0127 code to appear on a 2009 Ford Fusion?

Causes may include a faulty IAT sensor, dirty or clogged air filters, issues with the air intake system such as leaks or obstructions, or a malfunctioning engine cooling system.

How do I fix the P0127 code in a 2009 Ford Fusion?

To fix the P0127 code, start by inspecting the IAT sensor and its wiring for damage or disconnections. Replace the air filter if it's dirty. Check the air intake system for leaks or blockages, and ensure the engine's cooling system is functioning properly.

Is it safe to drive a 2009 Ford Fusion with the P0127 code?

While you can technically still drive, it's not recommended to continue driving with the P0127 code as it can lead to further engine damage due to overheating or other related issues. It's best to address the problem as soon as possible.

How do I test the IAT sensor in a 2009 Ford Fusion when diagnosing the P0127 code?

To test the IAT sensor, use a multimeter to check the resistance value and compare it to the manufacturerâ€™s specifications. A significant deviation from the norm indicates a faulty sensor.

Could the P0127 code affect the fuel economy of my 2009 Ford Fusion?

Yes, since the P0127 code indicates that the intake air temperature is too high, it can cause the engine to adjust its fuel mixture, often resulting in increased fuel consumption.

What tools are needed to diagnose the P0127 code on a 2009 Ford Fusion?

Typically, you will need an OBD-II scanner to read the code and monitor live data, a multimeter for testing the IAT sensor, and basic hand tools to access and inspect components.