why does my Honda Pilot Third Generation (2016-present) check engine light come on and off?

Solution

1. Preparation

• Gather tools and parts. Ensure the vehicle is parked on a level surface and the engine is cool.
• Tools Required: OBD-II scanner, socket set, torque wrench, multimeter, fuel pressure gauge.
• Safety Warnings: Disconnect the battery before working on electrical systems.

2. Address Fault Codes

• Sub-step 1: Use the OBD-II scanner to read any stored trouble codes.
• Sub-step 2: Research the error codes to identify specific issues (e.g., P0420 for catalyst efficiency).
• Sub-step 3: Clear the codes and perform a test drive to see if they reappear.

3. Inspect and Replace Components

• Sub-step 1: If codes indicate issues with the ignition system, remove the spark plugs and inspect for wear.
• Sub-step 2: Replace any worn spark plugs with new ones, ensuring proper torque (typically 13-15 lb-ft).
• Sub-step 3: If necessary, replace ignition coils following the manufacturer's torque specifications.

4. Check Fuel System

• Sub-step 1: Connect the fuel pressure gauge to the fuel rail.
• Sub-step 2: Turn the ignition to the "on" position (without starting the engine) to check for fuel pressure.
• Sub-step 3: If pressure is low, check the fuel pump and filter for proper operation and replace if needed.

5. Inspect and Seal Gas Cap

• Sub-step 1: Check the gas cap for cracks or damage.
• Sub-step 2: Clean the sealing surface on the fuel filler neck and the gas cap.
• Sub-step 3: Replace the gas cap if it is defective or does not seal properly.