why does my Honda Accord 10th Generation (2018-2022) engine light come on and off

Solution

1. Preparation

• Gather tools: OBD-II scanner, socket set, multimeter, vacuum gauge.
• Ensure the vehicle is parked on a level surface and the engine is cool.

2. Address Error Codes

• Connect the OBD-II scanner to the vehicle's diagnostic port.
• Retrieve and document any error codes.
• Research the codes to identify possible causes (e.g., P0420 for catalytic converter efficiency).

3. Inspect and Repair

• For gas cap issues:
  • Remove the gas cap and inspect for cracks or wear.
  • Replace the gas cap if necessary and ensure it clicks securely when reinstalled.
• For vacuum leaks:
  • Visually inspect vacuum hoses for cracks or disconnections.
  • Use a vacuum gauge to test the intake manifold for leaks, repairing or replacing hoses as needed.
• For electrical issues:
  • Check battery voltage with a multimeter; it should be between 12.4V and 12.7V.
  • Clean battery terminals and connections if corrosion is present.

4. Final Checks

• Clear all error codes with the OBD-II scanner.
• Start the engine and monitor for any reoccurring check engine light.