Honda Civic 10th Generation (2016-2021) check engine light came on after fuel fill, why?

Solution

1. Preparation

• Tools Required: OBD-II scanner, socket set, fuel pressure gauge, safety glasses, gloves.
• Disconnect the vehicle's battery to avoid any electrical shorts while working on the fuel system.

2. Inspect and Replace the Fuel Cap

• Sub-steps:
  1. Remove the fuel cap and inspect the rubber seal for wear or damage.
  2. If damaged, replace with a new OEM fuel cap that fits the Honda Civic.
  3. Reinstall the new fuel cap and ensure it clicks securely.

3. Inspect EVAP System Components

• Sub-steps:
  1. Locate the charcoal canister and purge valve.
  2. Disconnect the hoses from the canister and purge valve, checking for cracks or blockages.
  3. Replace any damaged hoses or components as needed.
  4. Reconnect all hoses securely.

4. Test Fuel Pressure

• Sub-steps:
  1. Connect the fuel pressure gauge to the fuel rail.
  2. Turn the ignition to the ON position (do not start the engine) and note the fuel pressure reading.
  3. Compare the reading to the specifications in the service manual; replace the fuel pump if pressure is low.

5. Clear Trouble Codes

• Sub-steps:
  1. Reconnect the battery terminal.
  2. Use the OBD-II scanner to clear any stored trouble codes.
  3. Start the vehicle and monitor for the check engine light.