why does my Toyota Highlander XU70 (2020-Present) engine light keep coming on

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the negative battery terminal to prevent electrical shorts.
• Allow the engine to cool completely before beginning work.

2. Address Error Codes

• Connect the OBD-II scanner to the vehicle's diagnostic port.
• Record any trouble codes that are displayed.
• Clear the codes and monitor if they reappear after a test drive.

3. Inspect and Repair Components

A. Gas Cap

• Remove the gas cap and inspect for cracks or wear.
• Replace it with a new gas cap if damaged.

B. Air Filter

• Remove the air filter housing cover.
• Take out the air filter and check for dirt and blockages.
• Replace the air filter if necessary.

C. Battery Connections

• Inspect battery terminals for corrosion.
• Clean terminals with a wire brush and reconnect securely.

4. Check for Leaks

• Place a clean cardboard sheet under the engine overnight to catch any leaks.
• Inspect hoses and seals for wear or damage.
• Replace any damaged hoses or seals found during inspection.

5. Reassemble and Test

• Reconnect the negative battery terminal.
• Start the engine and check for any warning lights.
• Take the vehicle for a short drive to see if the engine light reappears.