why does my Honda Accord 9th Generation (2013-2017) check engine light come on and off

Discover how to diagnose and resolve intermittent check engine light issues in Honda Accord 9th Generation. Step-by-step guide with diagnostic steps and solutions.

Solution

1. Preparation

• Tools Required: OBD-II scanner, socket set, torque wrench, vacuum gauge, fuel pressure gauge.
• Ensure the vehicle is parked on a level surface and the engine is cool.

2. Address Diagnostic Trouble Codes

• Connect the OBD-II scanner and record any codes.
• Research the codes to determine which system is affected (e.g., P0455 for EVAP leaks).
• Clear the codes and take the vehicle for a test drive to see if they return.

3. Inspect and Replace the Gas Cap

• Remove the gas cap and inspect for any signs of damage.
• If damaged, replace the gas cap with an OEM part.
• Ensure the new gas cap is tightened until it clicks.

4. Check and Replace Engine Air Filter

• Locate the air filter housing and remove the cover using a socket set.
• Remove the old air filter and inspect it for dirt and blockages.
• Replace with a new air filter if necessary, ensuring it fits snugly.

5. Inspect Ignition Components

• Remove the ignition coil cover using a socket set.
• Inspect the ignition coils and spark plugs for wear or damage.
• Replace any faulty spark plugs or ignition coils as needed.

6. Test for Vacuum Leaks

• Use a vacuum gauge to check the engine's vacuum levels.
• Inspect all hoses and connections for cracks or loose fittings.
• Replace any damaged hoses and ensure all connections are secure.

7. Check Fuel Pressure

• Connect a fuel pressure gauge to the fuel rail.
• Turn the ignition to the "ON" position without starting the engine to check pressure.
• If pressure is not within specifications, replace the fuel pump or filter as needed.