AutoCodes – Ford – P0721 1997 Ford F150

P0721 1997 Ford F150 Code - Output Shaft Speed Sensor Range/Performance

Quick Answer

The Output Shaft Speed (OSS) Sensor provides the Powertrain Control Module (PCM) with information about the rotational speed of an output shaft. Common causes include Faulty Output Speed Sensor (OSS), Output Speed Sensor harness is open or shorted, Output Speed 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: P0721 1997 Ford F150 indicates Output Shaft Speed Sensor Range/Performance.
Common causes: Common causes include Faulty Output Speed Sensor (OSS), Output Speed Sensor harness is open or shorted, Output Speed 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.

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Code Popularity 3,162

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Jul 13, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P0721 1997 Ford F150 Description

The Output Shaft Speed (OSS) Sensor provides the Powertrain Control Module (PCM) with information about the rotational speed of an output shaft. The PCM uses the information to control and diagnose powertrain behavior. In some applications, the sensor is also used as the source of vehicle speed. The sensor may be physically located in different places on the vehicle, depending upon the specific application. The design of each speed sensor is unique and depends on which powertrain control feature uses the information that is generated. The Diagnostic Trouble Code (DTC) will set if the PCM detects an OSS sensor out of range circuit.

OBDII Code P0721 1997 Ford F150 - Output Shaft Speed Sensor Range/Performance - AutoCodes.com — P0721 1997 Ford F150 Code - Output Shaft Speed Sensor Range/Performance

What does this mean?

What are the Possible Causes of the DTC P0721 1997 Ford F150?

Faulty Output Speed Sensor (OSS)
Output Speed Sensor harness is open or shorted
Output Speed Sensor circuit poor electrical connection
Faulty Powertrain Control Module (PCM)

How to Fix the DTC P0721 1997 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.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0721 1997 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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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 P0721 1997 Ford F150 Code

1. What are the common symptoms of OBDII code P0721 on a 1997 Ford F150?

- Common symptoms include erratic or non-functional speedometer readings, harsh shifting, and the transmission going into limp mode.

2. What does the OBDII code P0721 indicate on a 1997 Ford F150?

- OBDII code P0721 indicates a range/performance issue with the output shaft speed sensor in the transmission.

3. What are the possible causes of OBDII code P0721 on a 1997 Ford F150?

- Possible causes include a faulty output shaft speed sensor, damaged wiring or connectors, low transmission fluid level, or a malfunctioning transmission control module (TCM).

4. How can I diagnose the OBDII code P0721 on my 1997 Ford F150?

- Diagnose the code by checking the output shaft speed sensor for proper operation, inspecting the wiring and connectors for damage, and ensuring the transmission fluid level is adequate.

5. Can I drive my 1997 Ford F150 with an OBDII code P0721?

- It is not recommended to drive the vehicle with this code as it can lead to transmission issues and potential further damage.

6. How can I repair OBDII code P0721 on my 1997 Ford F150?

- Repair options include replacing the output shaft speed sensor, repairing any damaged wiring or connectors, ensuring the transmission fluid is at the correct level, and resetting the trouble codes.

7. Is it possible to reset the OBDII code P0721 on a 1997 Ford F150 without repairs?

- While you can clear the code temporarily, it is important to address the underlying issue to prevent further transmission problems.

8. Can a DIY enthusiast fix OBDII code P0721 on a 1997 Ford F150?

- Depending on your skill level, you may be able to replace the output shaft speed sensor or check the wiring. However, more complex issues may require professional help.

9. How much does it typically cost to repair OBDII code P0721 on a 1997 Ford F150?

- Repair costs can vary but generally range from $100 to $300 for parts and labor, depending on the specific cause of the issue.

10. Will OBDII code P0721 cause my 1997 Ford F150 to fail an emissions test?

- Yes, this code can trigger a check engine light, potentially leading to a failed emissions test. It is recommended to address the issue before undergoing emissions testing.