why does my Honda Pilot Third Generation (2016-present) check engine light stay on

Solution

1. Preparation

• Gather necessary tools and parts.
• Ensure the vehicle is parked on a flat surface with the engine off.
• Disconnect the battery to prevent electrical shorts during repairs.

2. Addressing Error Codes

• Sub-step 1: Connect the OBD-II scanner to the vehicle’s diagnostic port and retrieve stored trouble codes.
• Sub-step 2: Research the codes to determine the associated issues (e.g., P0420 - Catalyst System Efficiency Below Threshold).
• Sub-step 3: Document the codes for reference during repairs.

3. Inspect and Repair Components

• Sub-step 1: If the code indicates a faulty sensor (e.g., O2 sensor), remove the component using a socket set.
• Sub-step 2: Replace with a new sensor and torque to manufacturer specifications (usually around 30-40 ft-lbs).
• Sub-step 3: If the issue is with the catalytic converter, inspect for blockage and replace if necessary.

4. Clear Codes and Test

• Sub-step 1: Reconnect the battery and use the OBD-II scanner to clear the trouble codes.
• Sub-step 2: Start the engine and monitor for the check engine light to reappear.
• Sub-step 3: Test drive the vehicle for a short distance to ensure the issue is resolved.