my Honda Accord Eleventh Generation (2023-present) has a check engine light and rough idle

Solution

1. Preparation

• Ensure the vehicle is parked on a level surface and is turned off.
• Disconnect the negative battery terminal to avoid electrical shorts.
• Gather tools and parts required for the repair.

2. Address Error Codes

• Connect the OBD-II scanner and retrieve the error codes.
• Document the codes for reference and clear them to see if they return after the repair.

3. Inspect and Replace Spark Plugs

• Remove the engine cover if applicable.
• Use a socket wrench to remove the spark plugs.
• Inspect the spark plugs for wear; replace if necessary with OEM recommended parts.
• Torque the new spark plugs to the manufacturer's specifications (typically around 13-15 ft-lbs).

4. Clean or Replace the Throttle Body

• Remove the intake duct connected to the throttle body.
• Use throttle body cleaner and a soft cloth to clean the throttle body.
• If damaged, replace the throttle body with an OEM part.
• Reinstall the intake duct securely.

5. Check Fuel System

• Use a fuel pressure gauge to test the fuel system pressure according to manufacturer specifications.
• If pressure is low, inspect fuel pump and filter; replace as necessary.
• Ensure all connections are secure and free of leaks.

6. Reconnect Battery and Test

• Reconnect the negative battery terminal.
• Start the engine and allow it to idle to check for roughness.
• Observe for any returning check engine light.