why does my Toyota Highlander Fourth Generation (2020-present) check engine light flash

Solution

1. Preparation

• Gather tools and materials: OBD-II scanner, socket set, multimeter, fuel pressure gauge, replacement spark plugs, ignition coils (if necessary).
• Ensure the vehicle is parked on a level surface and the engine is cool.

2. Diagnose and Address Misfire

• Sub-step 1: Use the OBD-II scanner to retrieve trouble codes. Note any codes related to misfires (e.g., P0300 - P0306).
• Sub-step 2: If misfire codes are present, inspect spark plugs:
  • Remove the ignition coils and spark plugs.
  • Check for wear, carbon buildup, or damage. Replace if necessary.
• Sub-step 3: Test ignition coils with a multimeter:
  • Measure resistance according to manufacturer specifications. Replace any faulty coils.

3. Check Fuel System

• Sub-step 1: Inspect fuel injectors for clogs or leaks:
  • Disconnect the fuel line and check the injectors with a fuel pressure gauge.
• Sub-step 2: If fuel pressure is low, replace the fuel filter or fuel pump as needed.

4. Inspect Air Intake and Exhaust Systems

• Sub-step 1: Check the air filter and intake ducts for blockages:
  • Replace the air filter if dirty and ensure all hoses are secure.
• Sub-step 2: Inspect the exhaust system for leaks or obstructions:
  • Check the catalytic converter for signs of clogging or failure.