why is my Toyota Highlander Third Generation (2014-2019) dashboard warning lights on

Solution

1. Preparation

• Ensure the vehicle is parked on a level surface and the engine is off.
• Gather necessary tools and parts.

2. Address Diagnostic Trouble Codes

• Connect the OBD-II scanner and note down any DTCs.
• Research the codes to determine if they indicate a specific issue (e.g., P0420 for catalytic converter efficiency).

3. Fluid Level Check

• Open the hood and check oil level using the dipstick; add oil if needed.
• Check the coolant reservoir; refill with the appropriate coolant mixture if low.
• Inspect the brake fluid reservoir; top up with the recommended brake fluid.

4. Battery and Electrical System Inspection

• Disconnect the negative battery terminal and clean any corrosion using a wire brush.
• Reconnect the battery terminal securely.
• Test the battery voltage using a multimeter; replace the battery if below 12.4 volts.

5. Brake System Inspection

• Lift the vehicle using a jack and secure with jack stands.
• Inspect brake pads for wear; replace if they are below the recommended thickness.
• Check the brake fluid level and top up if necessary.

6. Resetting Warning Lights

• After addressing any issues, use the OBD-II scanner to clear the trouble codes.
• Start the engine and observe if the warning lights remain illuminated.