The vehicle speed sensor (VSS) in a 2004 Honda Accord is crucial for accurate speed readings and proper transmission function. Understanding its location and how to replace it can help maintain your vehicle's performance.

Location of the Speed Sensor

The speed sensor in the 2004 Honda Accord is located on the transmission. Specifically, there are two types of speed sensors you might be dealing with:

  • Input Speed Sensor: Found on the back side of the transmission, typically accessible from the driver's side. It is connected by a single electrical connector and secured with a 10mm bolt.

  • Output Speed Sensor: This sensor is located on the side of the transmission, near the output shaft. It also has an electrical connector and is held in place by a bolt.

To access these sensors, you may need to remove some components such as the air intake boot or airbox for better visibility and access.

Replacing the Speed Sensor

Tools Required

  • Pocket screwdriver
  • 10mm socket
  • Ratchet
  • Torque wrench
  • Cloth rags
  • Engine oil (for O-ring lubrication)
  • Gloves
  • Safety glasses

Replacement Steps

1. Preparation: Ensure your vehicle is in park, the ignition is off, and the parking brake is engaged. Disconnect the battery to avoid any electrical issues during replacement.

2. Accessing the Sensor: Depending on which sensor you are replacing (input or output), you may need to remove the air intake components for easier access.

3. Disconnecting the Electrical Connector: Locate the sensor and carefully disconnect its electrical connector by pressing on the locking tab.

4. Removing the Sensor:

- For both sensors, use a 10mm socket to remove the mounting bolt.

- Gently twist and pull out the sensor from its housing. If it feels stuck, ensure that you are not damaging any components during removal.

5. Installing the New Sensor:

- Before installing, apply a small amount of engine oil to the O-ring of the new sensor to facilitate a proper seal.

- Insert the new sensor into its housing and secure it with the mounting bolt. Torque it to manufacturer specifications (typically around 115 inch-pounds).

6. Reconnecting Everything: Reconnect the electrical connector securely and reassemble any components that were removed for access.

7. Final Checks: Reconnect your battery, start your vehicle, and check for any warning lights or issues with speed readings during a short test drive.

Important Considerations

  • Always ensure that you use genuine or high-quality aftermarket parts to avoid future issues.

  • If you're not comfortable performing this replacement yourself, consider seeking assistance from a professional mechanic.

FAQs About 2004 Honda Accord Speed Sensor

    • What symptoms indicate a faulty speed sensor?
      Common symptoms include erratic speedometer readings, transmission shifting issues, and triggering of check engine lights.
    • Can I drive my car with a bad speed sensor?
      While it's possible to drive, it may lead to further transmission problems or inaccurate speed readings.
    • How often should I replace my speed sensor?
      Speed sensors can last many years, but if you notice symptoms of failure, it's wise to replace them promptly.