Question

2000 Honda Accord V6 3.0L with engine code P0401. I have cleaned the port and replaced the EGR valve, and light returns, what can I do next?

Answer 1

You probably have to remove the intake to clean it.

P0401 2000 HONDA ACCORD - Exhaust Gas Recirculation Insufficient Flow

Read more: https://www.autocodes.com/p0401_2000_honda_accord.html

The page includes a link to a bulletin with the factory instruction on how to clean the intake.