how to fix a check engine light on my Honda Pilot YF3 (2016-2022)

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the negative battery terminal to ensure safety.
• Allow the engine to cool before starting work.

2. Addressing Specific Error Codes

• 2.1 For P0420 (Catalytic Converter Efficiency Below Threshold):

  • Inspect the catalytic converter for signs of damage or blockage.
  • If damaged, replace the catalytic converter.

• 2.2 For P0171 (System Too Lean):

  • Check the fuel injectors for blockage or malfunction.
  • Clean or replace fuel injectors as necessary.

• 2.3 For P0300 (Random Misfire Detected):

  • Inspect spark plugs and ignition coils for wear.
  • Replace faulty spark plugs or ignition coils.

3. Final Checks

• Reconnect the negative battery terminal.
• Clear the error codes using the OBD-II scanner.
• Start the engine and verify that the check engine light is off.