why does my Honda Civic 10th Generation (2016-2021) check engine light keep coming on

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the negative terminal of the battery to prevent electrical shorts.
• Allow the engine to cool down before proceeding with repairs.

2. Address Fault Codes

• Sub-step 1: Use the OBD-II scanner to read fault codes.
• Sub-step 2: Research error codes to determine the necessary repairs (e.g., P0420 for catalytic converter issues).
• Sub-step 3: Clear the codes after repairs to check if the issue is resolved.

3. Inspect and Replace Spark Plugs

• Sub-step 1: Remove the engine cover (if applicable) using a socket set.
• Sub-step 2: Disconnect ignition coil connectors and remove ignition coils.
• Sub-step 3: Unscrew and remove old spark plugs using a spark plug socket.
• Sub-step 4: Install new spark plugs, ensuring proper gap settings (typically 0.044 inches).
• Sub-step 5: Reinstall ignition coils and reconnect connectors.

4. Check and Replace Gas Cap

• Sub-step 1: Remove the gas cap and inspect for damage or wear.
• Sub-step 2: If the gas cap is faulty, replace it with an OEM or equivalent part.

5. Repair Vacuum Leaks

• Sub-step 1: Visually inspect vacuum hoses for cracks or disconnections.
• Sub-step 2: Use a smoke machine (if available) to detect leaks.
• Sub-step 3: Replace any damaged hoses.

6. Fuel System Pressure Test

• Sub-step 1: Connect a fuel pressure gauge to the fuel rail.
• Sub-step 2: Turn on the ignition (do not start the engine) and check the pressure readings against specifications (typically 40-50 psi).
• Sub-step 3: If pressure is low, inspect the fuel pump and filter for issues.