AutoCodes – Ford – P1112 2008 Ford Fusion

P1112 2008 Ford Fusion Code - Intake Air Temperature Sensor Intermittent Condition

Quick Answer

The IAT sensor is a thermistor device in which resistance changes with temperature. Common causes include Faulty Intake Air Temperature 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: P1112 2008 Ford Fusion indicates Intake Air Temperature Sensor Intermittent Condition.
Common causes: Common causes include Faulty Intake Air Temperature 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 1,876

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 Apr 19, 2019

Description
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code P1112 2008 Ford Fusion Description

The IAT sensor is a thermistor device in which resistance changes with temperature. The electrical 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 terminals 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. 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 air flow.
The IAT sensor provides a quicker temperature change response time than the ECT or CHT sensor.
Currently there are 2 types of IAT sensors used, a stand alone, non-integrated type and an integrated type. Both types function the same, however the integrated type is incorporated into the mass air flow (MAF) sensor instead of being a stand-alone sensor.

OBDII Code P1112 2008 Ford Fusion - Intake Air Temperature Sensor Intermittent Condition - AutoCodes.com — P1112 2008 Ford Fusion Code - Intake Air Temperature Sensor Intermittent Condition

What does this mean?

What are the Possible Causes of the DTC P1112 2008 Ford Fusion?

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

How to Fix the DTC P1112 2008 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 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.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P1112 2008 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.

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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 2008 Ford Fusion Code

1. What are the common symptoms of an Intake Air Temperature Sensor Intermittent Condition (OBDII code P1112) in a 2008 Ford Fusion?

The common symptoms include poor engine performance, reduced fuel efficiency, rough idling, and potential stalling.

2. What can cause the Intake Air Temperature Sensor Intermittent Condition in a 2008 Ford Fusion?

Possible causes include a faulty intake air temperature sensor, damaged wiring or connectors, loose connections, or a problem with the sensor circuit.

3. How can I diagnose the Intake Air Temperature Sensor Intermittent Condition on my 2008 Ford Fusion?

You can diagnose the issue by using an OBDII scanner to retrieve the trouble code P1112, visually inspecting the sensor and its connections, and performing a thorough check of the sensor circuit.

4. Can I drive my 2008 Ford Fusion with the P1112 code for the Intake Air Temperature Sensor Intermittent Condition?

It is not recommended to drive the vehicle with this code unresolved, as it can lead to further engine issues and potential breakdowns.

5. How can I repair the Intake Air Temperature Sensor Intermittent Condition on my 2008 Ford Fusion?

Repair options include replacing the intake air temperature sensor, repairing damaged wiring or connectors, ensuring proper sensor connection, and clearing the trouble code with an OBDII scanner.

6. Is it possible to reset the P1112 code on my 2008 Ford Fusion without fixing the underlying issue?

While you can clear the code temporarily with an OBDII scanner, it is crucial to address the root cause to prevent the code from reappearing.

7. How much does it cost to replace the intake air temperature sensor on a 2008 Ford Fusion?

The cost of replacing the sensor can vary depending on the location of the sensor, labor costs, and the brand of the replacement part, but it typically ranges from $50 to $150.

8. Can a dirty air filter trigger the Intake Air Temperature Sensor Intermittent Condition in a 2008 Ford Fusion?

A dirty air filter may affect the sensor readings indirectly by altering the air intake temperature, but it is not a direct cause of the P1112 trouble code.

9. Will the P1112 code for the Intake Air Temperature Sensor Intermittent Condition cause the check engine light to illuminate in a 2008 Ford Fusion?

Yes, the P1112 trouble code typically triggers the check engine light to illuminate on the dashboard of the 2008 Ford Fusion.

10. How long does it take to fix the Intake Air Temperature Sensor Intermittent Condition on a 2008 Ford Fusion?

The repair time can vary based on the extent of the issue and your experience level. It may take anywhere from 30 minutes to a few hours to diagnose and fix the problem.