what does it mean if my Toyota Highlander Fourth Generation (2020-present) has a flashing check engi...

Solution

1. Preparation

• Gather tools and parts needed for the repair.
• Ensure the vehicle is parked on a level surface and engage the parking brake.

2. Replace Faulty Spark Plugs and Ignition Coils

• Tools Required: Socket set, torque wrench, dielectric grease
• Remove the engine cover (if applicable) using a socket set.
• Disconnect the electrical connectors from the ignition coils.
• Remove the ignition coils by unscrewing the mounting bolts.
• Replace the spark plugs using a spark plug socket, ensuring to use the manufacturer’s specified torque (usually around 13-15 lb-ft).
• Reinstall the ignition coils with dielectric grease on the connector ends and secure them with bolts.

3. Check and Replace Fuel Filter (if applicable)

• Tools Required: Fuel line disconnect tool, container for fuel catch
• Relieve fuel pressure by removing the fuel pump fuse and running the engine until it stalls.
• Disconnect the fuel lines from the fuel filter using the fuel line disconnect tool.
• Replace the fuel filter with a new one, ensuring proper orientation.
• Reconnect the fuel lines and reinsert the fuel pump fuse.

4. Inspect Air Intake System

• Tools Required: Screwdriver set, flashlight
• Remove the air intake duct from the throttle body.
• Check the air filter for dirt or blockage and replace it if necessary.
• Inspect the intake manifold for any obstructions or leaks.

5. Clear Codes and Test Drive

• Use the OBD-II scanner to clear any stored trouble codes.
• Start the engine and take the vehicle for a test drive to ensure the check engine light remains off and the engine runs smoothly.