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 battery terminal to prevent any electrical shorts.

2. Address Error Codes

• Sub-step 1: Using the OBD-II scanner, retrieve and note down all error codes.
• Sub-step 2: Research the codes to determine the specific issues (e.g., P0420 for catalytic converter efficiency).
• Sub-step 3: Clear the error codes and take the vehicle for a short drive to see if they return.

3. Replace Faulty Components

• Sub-step 1: If the gas cap is damaged, replace it with an OEM or compatible part.
• Sub-step 2: If error codes indicate faulty ignition coils or spark plugs, remove the old components and install new ones according to manufacturer specifications.
• Sub-step 3: For any vacuum leaks found, replace damaged hoses or connections.

4. Check and Change Fluids

• Sub-step 1: If the engine oil is low or dirty, perform an oil change, replacing the oil filter and using manufacturer-recommended oil type.
• Sub-step 2: Ensure coolant levels are adequate and top off if necessary.

5. Reassemble and Test

• Sub-step 1: Reconnect the negative battery terminal.
• Sub-step 2: Start the engine and check for any unusual noises or warning lights.
• Sub-step 3: Take the vehicle for a test drive to ensure the check engine light does not reappear.