how to fix the check engine light on Toyota Highlander XU70 (2020-Present)

Solution

1. Preparation

• Gather tools and parts required for the repair.
• Disconnect the vehicle's battery to prevent electrical shorts.

Tools Required:

• OBD-II scanner
• Socket set
• Torque wrench
• Multimeter
• Screwdrivers
• Pliers

2. Addressing Error Codes

• Sub-step 1: Connect the OBD-II scanner to the vehicle’s diagnostic port.
• Sub-step 2: Retrieve and note down the error codes.
• Sub-step 3: Clear the error codes using the scanner.
• Sub-step 4: Monitor the check engine light for reactivation during a test drive.

3. Repairing Identified Issues

• If a specific part is faulty based on the retrieved codes:
  • Sub-step 1: Replace the faulty component (e.g., spark plugs, MAF sensor, or oxygen sensors).
  • Sub-step 2: Ensure proper torque specifications are followed during installation.
  • Sub-step 3: Reconnect any disconnected vacuum hoses or electrical connections.

4. Final Checks

• Sub-step 1: Reconnect the battery.
• Sub-step 2: Start the engine and allow it to reach operating temperature.
• Sub-step 3: Re-scan the OBD-II system to verify that no codes are present.