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Engine-Codes – Ford – P0720 1999 Ford F150

P0720 1999 Ford F150 Code - Output Shaft Speed Sensor Circuit Malfunction

Quick Answer

The P0720 code in a 1999 Ford F150 indicates a malfunction in the output shaft speed sensor circuit. Common causes include Faulty output shaft speed sensor, Damaged wiring or connectors in the sensor circuit, ECM malfunction. 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
P0720 1999 Ford F150 indicates Output Shaft Speed Sensor Circuit Malfunction.
Common causes
Common causes include Faulty output shaft speed sensor, Damaged wiring or connectors in the sensor circuit, ECM malfunction.
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 10, 2024
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Code P0720 1999 Ford F150 Description

The P0720 code in a 1999 Ford F150 indicates a malfunction in the output shaft speed sensor circuit. This sensor is responsible for monitoring the speed of the transmission's output shaft and sending this information to the vehicle's engine control module (ECM). The ECM uses this data to determine the proper shift points for the transmission, ensuring smooth and efficient operation. When the output shaft speed sensor circuit malfunctions, it can lead to a variety of performance issues and potentially cause long-term damage if left unaddressed.

OBDII Code P0720 1999 Ford F150 - Output Shaft Speed Sensor Circuit Malfunction
P0720 1999 Ford F150 Code - Output Shaft Speed Sensor Circuit Malfunction

Common Causes of P0720 1999 Ford F150

  1. Faulty output shaft speed sensor
  2. Damaged wiring or connectors in the sensor circuit
  3. ECM malfunction
  4. Transmission fluid contamination
  5. Mechanical issues in the transmission

Symptoms of P0720 1999 Ford F150

  1. Erratic shifting
  2. Harsh gear changes
  3. Transmission staying in one gear
  4. Poor fuel efficiency
  5. Decreased acceleration

How to Fix P0720 1999 Ford F150

  1. Perform a diagnostic scan to confirm the P0720 code and pinpoint the exact cause of the issue.
  2. Inspect the output shaft speed sensor, wiring, and connectors for any signs of damage or wear.
  3. Replace the faulty output shaft speed sensor if necessary.
  4. Repair or replace any damaged wiring or connectors in the sensor circuit.
  5. Clear the error code from the ECM's memory and test drive the vehicle to ensure proper operation.

Cost to Fix P0720 1999 Ford F150

The typical repair costs for addressing a P0720 code in a 1999 Ford F150 can range from $150 to $400, depending on the specific cause of the issue and the cost of parts and labor in your area. Keep in mind that diagnosis time and labor rates at auto repair shops can vary, so it's recommended to obtain quotes from multiple sources to ensure a competitive price. Additionally, factors such as the vehicle's make and model, engine type, and location can influence the final repair costs.

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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 P0720 1999 Ford F150 Code

1. What are the common symptoms of OBDII code P0720 on a 1999 Ford F150?

The common symptoms of OBDII code P0720 on a 1999 Ford F150 include erratic speedometer readings, harsh shifting, and the transmission going into limp mode.

2. What can cause the Output Shaft Speed Sensor Circuit Malfunction on a 1999 Ford F150?

The Output Shaft Speed Sensor Circuit Malfunction (P0720) on a 1999 Ford F150 can be caused by a faulty speed sensor, damaged wiring or connectors, or issues with the transmission control module.

3. How can I diagnose OBDII code P0720 on my 1999 Ford F150?

To diagnose OBDII code P0720 on a 1999 Ford F150, you can use a scan tool to read the trouble code, inspect the speed sensor and its wiring for damage, and test the sensor's resistance and output voltage.

4. Can I still drive my 1999 Ford F150 with OBDII code P0720?

It is not recommended to drive your 1999 Ford F150 with OBDII code P0720 as it can lead to further damage to the transmission and affect the vehicle's performance.

5. How much does it cost to repair OBDII code P0720 on a 1999 Ford F150?

The cost to repair OBDII code P0720 on a 1999 Ford F150 can vary depending on the root cause of the issue, but it typically ranges from $200 to $500 for parts and labor.

6. Can a DIY enthusiast fix OBDII code P0720 on a 1999 Ford F150?

A DIY enthusiast with the necessary tools and knowledge of automotive repair may be able to fix OBDII code P0720 on a 1999 Ford F150 by replacing the speed sensor and addressing any wiring issues.

7. Will resetting the OBDII code P0720 on a 1999 Ford F150 make it go away?

Resetting the OBDII code P0720 on a 1999 Ford F150 may temporarily clear the code, but if the underlying issue is not addressed, the code is likely to reappear once the vehicle is driven again.

8. How long does it take to repair OBDII code P0720 on a 1999 Ford F150?

The repair time for OBDII code P0720 on a 1999 Ford F150 can vary depending on the extent of the issue, but it typically takes a few hours to a full day to diagnose and fix the problem.

9. Can OBDII code P0720 on a 1999 Ford F150 cause other problems if left untreated?

If left untreated, OBDII code P0720 on a 1999 Ford F150 can lead to transmission issues, reduced fuel efficiency, and potential damage to other components in the drivetrain.

10. How often does OBDII code P0720 occur in 1999 Ford F150 vehicles?

OBDII code P0720, indicating an Output Shaft Speed Sensor Circuit Malfunction, can occur in 1999 Ford F150 vehicles due to sensor or wiring issues, but it is not considered a common problem in this specific model year.

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