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P1120 2002 Ford F150 Code - Throttle Position Sensor Out of Range

Quick Answer

The P1120 diagnostic trouble code for a 2002 Ford F150 indicates that the throttle position sensor is out of range. Common causes include Worn or damaged throttle position sensor, Loose or damaged wiring/connectors to the TPS, Corrosion or dirt build-up on TPS contacts. 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 2002 Ford F150 indicates Throttle Position Sensor Out of Range.
Common causes
Common causes include Worn or damaged throttle position sensor, Loose or damaged wiring/connectors to the TPS, Corrosion or dirt build-up on TPS contacts.
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 Aug 30, 2024
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Code P1120 2002 Ford F150 Description

The P1120 diagnostic trouble code for a 2002 Ford F150 indicates that the throttle position sensor is out of range. The throttle position sensor (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 ECM is receiving incorrect or inconsistent signals from the sensor, which can lead to various performance issues.

OBDII Code P1120 2002 Ford F150 - Throttle Position Sensor Out of Range
P1120 2002 Ford F150 Code - Throttle Position Sensor Out of Range

Common Causes of P1120 2002 Ford F150

  1. Worn or damaged throttle position sensor
  2. Loose or damaged wiring/connectors to the TPS
  3. Corrosion or dirt build-up on TPS contacts
  4. ECM software or hardware issues
  5. Incorrect TPS calibration

Symptoms of P1120 2002 Ford F150

  1. Rough idle
  2. Hesitation or surging during acceleration
  3. Poor fuel economy
  4. Engine stalling
  5. Reduced engine power

How to Fix P1120 2002 Ford F150

  1. Diagnose the issue by using a scan tool to read the TPS sensor data and check for any fault codes.
  2. Inspect the TPS wiring and connectors for damage, corrosion, or loose connections.
  3. Test the TPS sensor using a multimeter to check for proper resistance values.
  4. Replace the throttle position sensor if it is found to be faulty or out of range.
  5. Clear the fault codes and perform a test drive to ensure the issue has been resolved.

Cost to Fix P1120 2002 Ford F150

The cost of repairing a throttle position sensor out of range issue on a 2002 Ford F150 can vary depending on the specific cause of the problem and the labor rates in your area. On average, the cost of replacing a throttle position sensor ranges from $100 to $200, including parts and labor. However, additional costs may apply if other components need to be replaced or if further diagnostics are required. It's recommended to consult with a qualified mechanic or auto repair shop for a more accurate estimate based on your vehicle's specific needs.

What does this mean?

Tech Notes for P1120 2002 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 2002 Ford F150 Code

1. What are the common symptoms of OBDII code P1120 in a 2002 Ford F150 related to the throttle position sensor?

The common symptoms include rough idling, poor acceleration, stalling, and difficulty maintaining a consistent speed.

2. What are the potential causes of the OBDII code P1120 indicating that the throttle position sensor is out of range in a 2002 Ford F150?

The potential causes could be a faulty throttle position sensor, damaged wiring or connectors, a dirty throttle body, or issues with the vehicle's electronic control module.

3. How can I diagnose the throttle position sensor issue triggering the OBDII code P1120 in my 2002 Ford F150?

You can use a multimeter to test the throttle position sensor's voltage output, visually inspect the wiring and connectors for any damage, and clean the throttle body to see if it improves sensor performance.

4. Is it safe to continue driving my 2002 Ford F150 with the OBDII code P1120 for the throttle position sensor out of range?

It is not recommended to drive the vehicle with this code as it can lead to poor performance, decreased fuel efficiency, and potential safety hazards due to inconsistent throttle response.

5. Can I reset the OBDII code P1120 in my 2002 Ford F150 without addressing the underlying throttle position sensor issue?

Resetting the code without fixing the root cause will only temporarily clear the error code. It is essential to diagnose and repair the throttle position sensor problem to prevent the code from reoccurring.

6. What are some DIY repair tips for fixing the OBDII code P1120 related to the throttle position sensor in a 2002 Ford F150?

You can try cleaning the throttle body, inspecting and repairing any damaged wiring or connectors, and replacing the throttle position sensor if necessary. However, if you are unsure, it's best to consult a professional mechanic.

7. How much does it typically cost to repair the throttle position sensor issue triggering the OBDII code P1120 in a 2002 Ford F150?

The cost of repair can vary depending on the exact cause of the issue, but it may range from $100 to $300 for parts and labor if you take your vehicle to a mechanic.

8. Will replacing the throttle position sensor resolve the OBDII code P1120 in my 2002 Ford F150?

In many cases, replacing the faulty throttle position sensor will resolve the issue and clear the code. However, it's essential to ensure proper installation and calibration for optimal performance.

9. Can extreme weather conditions affect the throttle position sensor performance and trigger the OBDII code P1120 in a 2002 Ford F150?

Yes, extreme temperatures or humidity levels can impact the sensor's readings and lead to the code being triggered. It's crucial to keep the sensor and its connections well-protected.

10. How long does it typically take to repair the throttle position sensor issue causing the OBDII code P1120 in a 2002 Ford F150?

The repair time can vary based on the extent of the issue and the availability of parts. In most cases, a professional mechanic can complete the repair within a few hours to a day.

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