how to clear Honda Accord 9th Generation (2013-2017) P0401 code

Solution

1. Preparation

• Gather necessary tools and parts.
• Ensure the vehicle is parked on a level surface and the engine is off and cool.
• Disconnect the negative battery terminal.

2. Inspect and Clean EGR Valve

• Locate the EGR valve, which is typically mounted on the intake manifold.
• Remove any electrical connectors and vacuum lines attached to the EGR valve.
• Unbolt the EGR valve from its mounting bracket using a socket set.
• Inspect the valve for carbon buildup. If dirty, clean it using carburetor cleaner and a soft brush.
• Reinstall the EGR valve, ensuring a proper seal with a new gasket if necessary.

3. Clean EGR Passages

• Use a suitable intake cleaner to spray into the EGR passageways to remove any carbon deposits.
• Allow the cleaner to soak for a few minutes, then use a flexible brush or pipe cleaner to dislodge any stubborn deposits.
• Rinse with clean water (if applicable) and ensure all passages are clear.

4. Test and Replace Components if Necessary

• Reconnect the EGR valve and electrical connectors.
• Test the valve's function by applying vacuum using a hand-held vacuum pump. Ensure it opens and closes correctly.
• Inspect and replace any damaged vacuum lines if leaks are found during the diagnostic step.

5. Clear Error Codes

• Reconnect the negative battery terminal.
• Use an OBD-II scanner to clear the P0401 code from the engine control module (ECM).
• Monitor for any reoccurrence of the code after repairs.