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P1120 1999 Ford F150 Code - Throttle Position Sensor Out of Range

Quick Answer

The P1120 diagnostic trouble code (DTC) for a 1999 Ford F150 indicates that the Throttle Position Sensor (TPS) is out of range. Common causes include Faulty Throttle Position Sensor, Wiring or connector issues, Dirty throttle body. 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
P1120 1999 Ford F150 indicates Throttle Position Sensor Out of Range.
Common causes
Common causes include Faulty Throttle Position Sensor, Wiring or connector issues, Dirty throttle body.
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 14, 2024
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Code P1120 1999 Ford F150 Description

The P1120 diagnostic trouble code (DTC) for a 1999 Ford F150 indicates that the Throttle Position Sensor (TPS) is out of range. The TPS is a crucial component of the vehicle's electronic fuel injection system, as it monitors the position of the throttle valve and sends this information to the engine control module (ECM). When the TPS is out of range, it means that the sensor is providing incorrect data to the ECM, which can lead to a variety of performance issues.

OBDII Code P1120 1999 Ford F150 - Throttle Position Sensor Out of Range
P1120 1999 Ford F150 Code - Throttle Position Sensor Out of Range

Common Causes of P1120 1999 Ford F150

  1. Faulty Throttle Position Sensor
  2. Wiring or connector issues
  3. Dirty throttle body
  4. ECM malfunction
  5. Corrosion or damage to sensor connections

Symptoms of P1120 1999 Ford F150

  1. Rough idling
  2. Stalling
  3. Hesitation during acceleration
  4. Poor fuel efficiency
  5. Decreased engine performance

How to Fix P1120 1999 Ford F150

  1. Begin by diagnosing the issue using a scan tool to confirm the P1120 code and identify the specific problem with the TPS.
  2. Inspect the TPS, wiring, and connectors for any visible damage or corrosion. Replace any damaged components.
  3. Clean the throttle body to ensure proper operation and prevent future issues.
  4. Reset the ECM and perform a throttle position sensor relearn procedure to calibrate the new sensor correctly.
  5. Test drive the vehicle to ensure that the issue has been resolved and that the TPS is now within the correct range.

Cost to Fix P1120 1999 Ford F150

The cost of repairing a Throttle Position Sensor out of range issue on a 1999 Ford F150 can vary depending on the specific cause of the problem and the cost of parts and labor in your area. On average, the cost of replacing a faulty TPS can range from $100 to $300, including parts and labor. Additional costs may apply if other components need to be replaced or if further diagnosis is required. It's recommended to consult with a trusted mechanic or auto repair shop to get an accurate estimate based on your vehicle's specific needs. Labor rates typically range from $80 to $150 per hour, but can vary based on location and shop rates.

What does this mean?

Tech Notes for P1120 1999 Ford F150

The TP sensor circuit is monitored by the PCM for a low TP rotation angle (or voltage) input below the closed throttle position through the comprehensive component monitor (CCM). If during key ON engine OFF or key ON engine running the TP rotation angle (or voltage) remains within the calibrated self-test range but falls between 3.42 and 9.85% (0.17 and 0.49 volt), the test fails.

When is the Code Detected?

Malfunction is detected when voltage from the sensor is sent to Engine Control Module (ECM) is out of range.

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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 P1120 1999 Ford F150 Code

1. What are the common symptoms of OBDII code P1120 on a 1999 Ford F150?

- Common symptoms include rough idling, stalling, poor acceleration, and the vehicle going into "limp mode."

2. What are the possible causes of the Throttle Position Sensor Out of Range code on a 1999 Ford F150?

- Possible causes include a faulty throttle position sensor, damaged wiring or connectors, a dirty throttle body, or a problem with the throttle control system.

3. How can I diagnose the cause of OBDII code P1120 on my 1999 Ford F150?

- You can use a scan tool to read the code, check the throttle position sensor's voltage, inspect the wiring for damage, and clean the throttle body to diagnose the issue.

4. Can I drive my 1999 Ford F150 with OBDII code P1120?

- It is not recommended to drive the vehicle with this code as it can lead to poor performance and potential safety hazards.

5. How can I repair OBDII code P1120 on my 1999 Ford F150?

- Repair options include replacing the throttle position sensor, repairing any damaged wiring, cleaning the throttle body, or addressing any issues with the throttle control system.

6. Is it safe to continue driving if the Throttle Position Sensor Out of Range code clears on its own?

- It is still recommended to diagnose and address the issue, as intermittent occurrences of this code may indicate an underlying problem that requires attention.

7. Will disconnecting the battery reset OBDII code P1120 on a 1999 Ford F150?

- Disconnecting the battery may temporarily clear the code, but if the underlying issue is not addressed, the code is likely to return.

8. How much does it typically cost to repair OBDII code P1120 on a 1999 Ford F150?

- The cost of repair can vary depending on the specific cause of the code, but it may range from $100 to $300 for parts and labor.

9. Can a DIY enthusiast tackle the repair for OBDII code P1120 on a 1999 Ford F150?

- Depending on their skill level, a DIY enthusiast may be able to replace the throttle position sensor or clean the throttle body, but more complex issues may require professional assistance.

10. How often does the Throttle Position Sensor Out of Range code occur on a 1999 Ford F150?

- The frequency of this code can vary, but it is a relatively common issue in vehicles with throttle position sensors.

Discuss the causes and fixes for P1120 1999 Ford F150 OBDII Code

Submit a New Comment

  • How can I test the causes of this issue? I have replaced the TPS and the light when away but now its back on for the third time so I decided to do some homework could you guys help me out?

    Reply to Comment

  • As the code description indicates the TPS is out of range and tha usually means that the TPS is not properly adjusted. You could try adjusting the TPS one more time before replacing.

    What engine size is your F150? here is a good tutorial to adjust the TPS: http://www.f150hub.com/main...

    Reply to Comment