AutoCodes – Ford – P1112 1998 Ford F150

P1112 1998 Ford F150 Code - Intake Air Temperature Sensor Intermittent

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 1998 Ford F150 indicates Intake Air Temperature Sensor Intermittent .
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 2,164

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 1998 Ford F150 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 1998 Ford F150 - Intake Air Temperature Sensor Intermittent - AutoCodes.com — P1112 1998 Ford F150 Code - Intake Air Temperature Sensor Intermittent

What does this mean?

What are the Possible Causes of the DTC P1112 1998 Ford F150?

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 1998 Ford F150?

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 1998 Ford F150 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 1998 Ford F150 Code

1. What are the common symptoms of an intermittent intake air temperature sensor (IAT) issue with OBDII code P1112 on a 1998 Ford F150?

- Common symptoms include rough idling, decreased fuel efficiency, engine misfires, and potential stalling.

2. What are the possible causes of an intermittent intake air temperature sensor issue triggering OBDII code P1112 in a 1998 Ford F150?

- Causes may include a faulty IAT sensor, wiring or connector issues, a dirty air filter, or a vacuum leak near the sensor.

3. How can I diagnose an intermittent intake air temperature sensor problem related to OBDII code P1112 on my 1998 Ford F150?

- Use a multimeter to test the IAT sensor's resistance, check for loose or damaged wiring, inspect the air filter, and look for any vacuum leaks.

4. Can a dirty air filter trigger OBDII code P1112 in a 1998 Ford F150?

- Yes, a dirty air filter can disrupt the airflow reading to the IAT sensor, causing it to intermittently trigger the P1112 code.

5. Is it safe to continue driving a 1998 Ford F150 with an intermittent intake air temperature sensor issue causing OBDII code P1112?

- It is not recommended to continue driving with this issue, as it can lead to poor engine performance and potential further damage if left unresolved.

6. How do I repair an intermittent intake air temperature sensor issue triggering OBDII code P1112 on my 1998 Ford F150?

- Replace the faulty IAT sensor, repair any damaged wiring, clean or replace the air filter, and fix any vacuum leaks near the sensor.

7. Can a DIY enthusiast fix an intermittent intake air temperature sensor problem related to OBDII code P1112 on a 1998 Ford F150?

- Depending on the skill level, a DIY enthusiast can attempt to diagnose and repair this issue, but professional help may be needed for more complex issues.

8. Will resetting the OBDII system clear the P1112 code related to an intermittent intake air temperature sensor on a 1998 Ford F150?

- Resetting the system may temporarily clear the code, but it will likely return if the underlying issue causing the P1112 code is not addressed.

9. Are there any specific tools required to diagnose and repair an intermittent intake air temperature sensor issue triggering OBDII code P1112 on a 1998 Ford F150?

- Basic tools such as a multimeter, screwdrivers, and pliers may be needed for diagnosing and repairing this issue, along with a replacement IAT sensor if necessary.

10. How can regular maintenance help prevent OBDII code P1112 related to an intermittent intake air temperature sensor issue in a 1998 Ford F150?

- Regularly checking and replacing the air filter, inspecting wiring connections, and ensuring the IAT sensor is functioning properly can help prevent issues triggering the P1112 code.