how to fix the check engine light on my Honda Pilot Third Generation (2016-present)

Solution

1. Preparation

• Gather tools: OBD-II scanner, socket set, screwdrivers, multimeter, vacuum gauge.
• Ensure the vehicle is parked on a level surface and the engine is cool.
• Disconnect the negative battery terminal to reset the system after repairs.

2. Addressing Error Codes

• Connect the OBD-II scanner to the vehicle’s diagnostic port.
• Retrieve and note the error codes displayed.
• Research the error codes to determine the associated issues (e.g. P0420 for catalytic converter efficiency).

3. Repairing Identified Issues

• If the gas cap is faulty:

  • Remove the old gas cap and replace it with a new one.

• If it’s an air intake leak:

  • Locate the source of the leak in hoses or intake manifold.
  • Replace any damaged hoses or tighten loose connections.

• If the problem is with the catalytic converter or O2 sensors:

  • Raise the vehicle securely and remove the exhaust components as needed.
  • Replace the faulty catalytic converter or O2 sensors, ensuring all gaskets are new and secure.

• If the issue is a misfire (spark plugs or ignition coils):

  • Remove the ignition coils by unbolting them.
  • Inspect and replace any faulty coils and/or spark plugs.

4. Resetting the Check Engine Light

• After repairs are complete, reconnect the negative battery terminal.
• Use the OBD-II scanner to clear the error codes from the system.