how to fix the P0720 code in my Toyota Corolla E210 (2019-2024)?

Learn how to diagnose and fix P0720 vehicle speed sensor issues in Toyota Corolla E210. Step-by-step guide with diagnostic procedures and repair instructions.

Solution

1. Preparation

• Gather all necessary tools and parts.
• Disconnect the battery to ensure safety while working on electrical components.
• Tools Required: OBD-II scanner, multimeter, socket set, torque wrench, wire brush, and cleaning solvent.

2. Remove the Vehicle Speed Sensor

• Locate the VSS on the transmission.
• Unplug the electrical connector from the VSS.
• Remove the mounting bolts using a socket set.
• Carefully pull the VSS out of its housing.

3. Inspect and Clean

• Inspect the VSS for any physical damage or wear.
• Clean the sensor and the surrounding area with a wire brush and cleaning solvent to remove debris and corrosion.
• Check the sensor's O-ring for damage and replace if necessary.

4. Install New or Repaired VSS

• If the VSS is faulty, replace it with a new unit. Ensure it matches the original specifications.
• Apply a small amount of oil to the O-ring for easier installation.
• Insert the new VSS into its housing and secure it with the mounting bolts, tightening them to the manufacturer's specified torque values.
• Reconnect the electrical connector firmly.

5. Reconnect Battery and Test

• Reconnect the vehicle's battery.
• Start the engine and allow it to idle.
• Clear the P0720 code from the ECU using the OBD-II scanner.
• Test drive the vehicle to ensure the check engine light does not reappear and the speedometer functions correctly.