P1112 1999 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 1999 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 1999 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 1999 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 1999 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 1999 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 1999 Ford F150 Code
1. What does the OBDII code P1112 mean on a 1999 Ford F150?
P1112 indicates an intermittent issue with the Intake Air Temperature (IAT) sensor, which measures the temperature of the air entering the engine.
2. What are common symptoms of code P1112 in a 1999 Ford F150?
Common symptoms include rough idling, poor fuel economy, reduced engine performance, and an illuminated Check Engine Light.
3. What causes the P1112 code on a 1999 Ford F150?
This code is typically caused by a faulty IAT sensor, damaged or corroded wiring, poor electrical connections, or a malfunctioning Powertrain Control Module (PCM).
4. Can a dirty air filter cause the P1112 code?
While a dirty air filter won’t directly cause this code, it can contribute to poor airflow, which may affect the IAT sensor’s readings indirectly.
5. How do I diagnose the P1112 code on a 1999 Ford F150?
Start by visually inspecting the IAT sensor and its wiring for damage or corrosion. Use a multimeter to test the sensor’s resistance and check for proper voltage at the connector.
6. Can I drive my 1999 Ford F150 with the P1112 code?
While the truck may still be drivable, ignoring the code can lead to poor engine performance and increased fuel consumption. It’s best to address the issue promptly.
7. How do I fix the P1112 code on a 1999 Ford F150?
Repairs may include replacing the IAT sensor, repairing damaged wiring, cleaning electrical connections, or updating the PCM if necessary.
8. Where is the Intake Air Temperature sensor located on a 1999 Ford F150?
The IAT sensor is typically located in the air intake duct or integrated into the Mass Air Flow (MAF) sensor assembly.
9. How much does it cost to fix the P1112 code on a 1999 Ford F150?
The cost can vary, but replacing the IAT sensor typically ranges from $50 to $150, including parts and labor. Wiring repairs may increase this cost.
10. Can a P1112 code be cleared without fixing the problem?
Clearing the code with an OBDII scanner may temporarily turn off the Check Engine Light, but the issue will likely return unless the underlying problem is resolved.
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