how to fix check engine light in Honda Civic 10th Generation (2016-2021)

Solution

1. Preparation

• Gather tools: OBD-II scanner, socket set, torque wrench, multimeter.
• Ensure the vehicle is parked on a flat surface and the engine is cool.
• Disconnect the battery to prevent any electrical shorts while working.

2. Repair Identified Issues

• If code indicates a faulty sensor (e.g., O2 sensor, mass airflow sensor)

  1. Locate the sensor based on the error code.
  2. Disconnect the sensor's electrical connector.
  3. Use the appropriate socket to remove the faulty sensor.
  4. Install the new sensor by threading it into place and tightening it to the manufacturer's torque specifications (usually around 30-35 lb-ft for O2 sensors).
  5. Reconnect the electrical connector.

• If gas cap is faulty

  1. Remove the gas cap and inspect for cracks or wear.
  2. Replace with a new gas cap if damaged.
  3. Ensure it seals properly when retightened.

• If vacuum hoses are damaged

  1. Identify the damaged hoses during the visual inspection.
  2. Cut the damaged section out or replace the entire hose.
  3. Secure the new hoses with clamps if necessary.

3. Clear Error Codes

1. Reconnect the battery.
2. Use the OBD-II scanner to clear any stored trouble codes.
3. Turn the ignition to the "ON" position without starting the engine, then check if the check engine light is still illuminated.