P1112 2003 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 2003 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.
Code P1112 2003 Ford F150 Description
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.
What are the Possible Causes of the DTC P1112 2003 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 2003 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.
Code Tech Notes
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P1112 2003 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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Frequently Asked Questions about P1112 2003 Ford F150 Code
1. What does the OBDII code P1112 mean on a 2003 Ford F150?
P1112 indicates an "Intake Air Temperature Sensor Intermittent" issue, meaning the sensor is sending inconsistent readings to the engine control module (ECM).
2. What are the symptoms of code P1112 on a 2003 Ford F150?
Common symptoms include poor fuel economy, rough idling, hesitation during acceleration, and the check engine light being illuminated.
3. What causes the P1112 code on a 2003 Ford F150?
Possible causes include a faulty intake air temperature (IAT) sensor, damaged wiring or connectors, corrosion in the electrical circuit, or a failing engine control module (ECM).
4. How do I diagnose the P1112 code on my 2003 Ford F150?
Start by inspecting the IAT sensor and its wiring for damage or corrosion. Use a multimeter to test the sensor's resistance and confirm it changes with temperature. Check for proper voltage at the connector.
5. Can a dirty air filter cause the P1112 code on a 2003 Ford F150?
A dirty air filter is unlikely to directly cause the P1112 code, but it can affect overall engine performance and airflow, which might exacerbate related issues.
6. How do I fix the P1112 code on my 2003 Ford F150?
Repair or replace the intake air temperature sensor if faulty. Fix any damaged wiring or connectors, and clear the code with a scan tool after repairs are completed.
7. Can I drive my 2003 Ford F150 with the P1112 code?
While the truck may still be drivable, it could experience poor performance or fuel efficiency. Prolonged driving without repair could lead to further engine issues.
8. How much does it cost to fix the P1112 code on a 2003 Ford F150?
Replacing the intake air temperature sensor typically costs $50-$150, depending on parts and labor. Wiring repairs may add to the cost if needed.
9. Where is the intake air temperature sensor located on a 2003 Ford F150?
The IAT sensor is usually located on or near the air intake tube between the air filter box and the throttle body.
10. Can a faulty mass air flow sensor trigger the P1112 code on a 2003 Ford F150?
While the mass air flow (MAF) sensor is separate, issues with the MAF sensor could cause related airflow problems. However, the P1112 code specifically points to the IAT sensor or its circuit.
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