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

Solution

1. Preparation

• Gather necessary tools and parts.
• Ensure the vehicle is parked on a level surface with the engine off.
• Disconnect the battery to ensure safety while working on electrical components.

2. Address Trouble Codes

• Sub-step 1: Use the OBD-II scanner to retrieve the trouble codes.
• Sub-step 2: Research the codes to determine the specific issue (e.g., P0420 for catalytic converter efficiency).
• Sub-step 3: Address the specific issue based on the trouble code (e.g., replace the faulty sensor or component).

3. Inspect and Replace Components

• Sub-step 1: If a faulty sensor is indicated (e.g., oxygen sensor), locate the sensor based on vehicle diagrams.
• Sub-step 2: Remove the sensor using a socket set and replace it with a new part, ensuring it is torqued to specifications.
• Sub-step 3: If the gas cap is found to be faulty or loose, replace it with a new, OEM-quality gas cap.

4. Clear Codes and Reconnect Battery

• Sub-step 1: Reconnect the battery terminals securely.
• Sub-step 2: Use the OBD-II scanner to clear the error codes.
• Sub-step 3: Start the engine and allow it to reach normal operating temperature.