how do I fix the check engine light on my Honda Civic 10th Generation (2016-2021)

Solution

1. Preparation

• Gather necessary tools and parts.
• Ensure the vehicle is parked on a level surface and the engine is off.
• Disconnect the battery to prevent any electrical shorts.

2. Scan and Document Codes

• Connect the OBD-II scanner to the vehicle's diagnostic port.
• Turn the ignition to the ON position without starting the engine.
• Retrieve and document any trouble codes displayed on the scanner.

3. Addressing Common Issues

A. Replace Faulty Sensors

• Based on the retrieved codes, identify any faulty sensors (e.g., oxygen sensor, mass airflow sensor).
• Remove the electrical connector from the faulty sensor.
• Unscrew the sensor using the appropriate socket.
• Install the new sensor and reconnect the electrical connector.

B. Repair or Replace Wiring

• Inspect wiring for broken or frayed areas.
• If damaged, splice in new wire of the same gauge or replace the entire harness if necessary.
• Use heat shrink tubing or electrical tape to insulate connections.

4. Reassemble and Clear Codes

• Reconnect the battery terminal securely.
• Start the engine and ensure no unusual noises are present.
• Use the OBD-II scanner to clear the trouble codes.
• Monitor the check engine light for re-illumination.