my Toyota Highlander Fourth Generation (2020-present) check engine light keeps flashing what does it...

Solution

1. Preparation

• Gather necessary tools and parts.
• Park the vehicle on a flat surface and engage the parking brake.
• Disconnect the battery to ensure safety while working.

2. Address Ignition System Issues

• Tools Required: Socket set, spark plug socket, torque wrench.
• Remove the engine cover (if applicable).
• Disconnect the ignition coil connectors and remove the ignition coils.
• Inspect and replace faulty spark plugs (use OEM recommended spark plugs).
  • Torque to manufacturer specifications (typically around 13 ft-lbs).
• Reinstall ignition coils and reconnect connectors.

3. Fuel System Inspection

• Tools Required: Fuel pressure gauge, wrench set.
• Locate the fuel pressure test port on the fuel rail.
• Connect the fuel pressure gauge and turn the ignition to the "ON" position (do not start the engine).
• Check the fuel pressure against manufacturer specifications (typically 40-50 psi).
• If pressure is low, inspect fuel pump and fuel filter for issues.
• Replace any faulty components.

4. Air Intake and Exhaust System Check

• Tools Required: Screwdriver set, vacuum gauge.
• Inspect the air filter and replace if dirty or clogged.
• Check the intake hoses for cracks or loose connections.
• Perform a smoke test to detect vacuum leaks.
• Inspect the exhaust system for blockages (e.g., clogged catalytic converter).