why does my Honda Accord 8th Generation (2008-2012) check engine light keep coming on

Solution

1. Preparation

• Gather necessary tools and parts.
• Park the vehicle on a level surface and engage the parking brake.
• Disconnect the battery to ensure safety while working on electrical components.

2. Address Fault Codes

• Use the OBD-II scanner to retrieve and document all stored fault codes.
• Research codes to identify the specific issue (e.g., P0420 for catalytic converter efficiency).

3. Repair According to Identified Issues

A. If gas cap is faulty:

• Remove the gas cap and inspect for cracks or damage.
• Replace with a new gas cap if necessary.

B. If spark plugs or ignition coils are faulty:

• Remove the engine cover (if applicable).
• Disconnect the ignition coil connectors and remove the bolts securing them.
• Replace faulty coils and spark plugs with new ones, ensuring proper torque (typically 13-15 lb-ft for spark plugs).

C. If air filter is dirty:

• Remove the air filter housing cover.
• Replace the old air filter with a new one, ensuring it fits snugly.

D. If fuel system pressure is low:

• Connect a fuel pressure gauge to the fuel rail.
• If the pressure is below specifications, check the fuel pump and replace if necessary.

4. Reconnect Battery

• Once repairs are completed, reconnect the battery terminals securely.

5. Clear Codes

• Use the OBD-II scanner to clear the codes and reset the check engine light.