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P1791 1999 Honda Civic Code - Vehicle Speed Sensor Range/Performance Problem

Quick Answer

The P1791 diagnostic trouble code (DTC) for a 1999 Honda Civic indicates a Vehicle Speed Sensor (VSS) Range/Performance Problem. Common causes include Faulty Vehicle Speed Sensor, Damaged wiring or connectors related to the VSS, Corrosion or debris affecting the VSS. 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
P1791 1999 Honda Civic indicates Vehicle Speed Sensor Range/Performance Problem.
Common causes
Common causes include Faulty Vehicle Speed Sensor, Damaged wiring or connectors related to the VSS, Corrosion or debris affecting the VSS.
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 17, 2024
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Code P1791 1999 Honda Civic Description

The P1791 diagnostic trouble code (DTC) for a 1999 Honda Civic indicates a Vehicle Speed Sensor (VSS) Range/Performance Problem. The VSS is a crucial component of the vehicle's electronic control system, as it provides the Engine Control Module (ECM) with information about the speed of the vehicle. This data is used by the ECM to adjust various parameters such as fuel injection timing, transmission shifting, and cruise control operation.

OBDII Code P1791 1999 Honda Civic - Vehicle Speed Sensor Range/Performance Problem
P1791 1999 Honda Civic Code - Vehicle Speed Sensor Range/Performance Problem

Common Causes of P1791 1999 Honda Civic

  1. Faulty Vehicle Speed Sensor
  2. Damaged wiring or connectors related to the VSS
  3. Corrosion or debris affecting the VSS
  4. Issues with the ECM or related control modules
  5. Electrical problems within the vehicle's system

Symptoms of P1791 1999 Honda Civic

  1. Inaccurate speedometer readings
  2. Erratic shifting of the transmission
  3. Poor fuel efficiency
  4. Stalling or hesitation during acceleration
  5. Illumination of the Check Engine Light

How to Fix P1791 1999 Honda Civic

  1. Begin by diagnosing the issue using a scan tool to retrieve the specific trouble code and pinpoint the exact cause of the problem.
  2. Inspect the VSS, wiring, and connectors for any visible damage or corrosion. Replace any components that are faulty.
  3. Test the VSS using a multimeter to ensure it is functioning within the manufacturer's specifications.
  4. Clear the DTC from the ECM's memory using the scan tool and test drive the vehicle to verify that the issue has been resolved.
  5. If the problem persists, further diagnostics may be necessary to identify any underlying issues with the vehicle's systems.

Cost to Fix P1791 1999 Honda Civic

The typical repair costs for addressing a P1791 code on a 1999 Honda Civic can vary depending on the specific cause of the issue. In general, replacing a faulty VSS or repairing damaged wiring may cost between $100 and $300 for parts and labor. Additional diagnostic time and labor rates at auto repair shops can range from $80 to $150 per hour. It is recommended to consult with a qualified mechanic to obtain a more accurate estimate based on your location and vehicle's specific needs.

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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 P1791 1999 Honda Civic Code

1. What are the common symptoms of OBDII code P1791 on a 1999 Honda Civic?

- Common symptoms include erratic speedometer readings, inoperative cruise control, harsh shifting, and illuminated Check Engine Light.

2. What does the OBDII code P1791 for a 1999 Honda Civic indicate?

- The code P1791 indicates a Vehicle Speed Sensor Range/Performance Problem.

3. What are the possible causes of OBDII code P1791 on a 1999 Honda Civic?

- Possible causes include a faulty vehicle speed sensor, damaged wiring or connectors, sensor alignment issues, or a malfunctioning speedometer.

4. How can I diagnose the Vehicle Speed Sensor on a 1999 Honda Civic?

- You can diagnose the Vehicle Speed Sensor by checking the sensor's wiring and connectors for damage, testing the sensor's output signal, and verifying the sensor's alignment.

5. Can a faulty Vehicle Speed Sensor cause other issues besides triggering code P1791 on a 1999 Honda Civic?

- Yes, a faulty Vehicle Speed Sensor can also cause issues such as incorrect shifting patterns, inaccurate speedometer readings, and non-functioning cruise control.

6. How can I repair OBDII code P1791 on a 1999 Honda Civic?

- Repairing code P1791 involves replacing the faulty Vehicle Speed Sensor, repairing any damaged wiring or connectors, and ensuring proper alignment of the sensor.

7. Is it safe to continue driving with OBDII code P1791 on a 1999 Honda Civic?

- It is not recommended to continue driving with code P1791 present, as it can affect the vehicle's performance and safety systems.

8. Can a DIY enthusiast fix OBDII code P1791 on a 1999 Honda Civic?

- Yes, a DIY enthusiast with the necessary tools and knowledge can fix code P1791 by replacing the Vehicle Speed Sensor and addressing any related issues.

9. How much does it typically cost to repair OBDII code P1791 on a 1999 Honda Civic?

- The cost of repairing code P1791 can vary depending on the cause of the issue, but typically ranges from $100 to $300 for parts and labor.

10. Will resetting the Check Engine Light resolve OBDII code P1791 on a 1999 Honda Civic?

- Resetting the Check Engine Light may temporarily turn off the light, but it will not fix the underlying issue causing code P1791. It is important to diagnose and repair the problem to prevent it from reoccurring.

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