Honda P0401 Code Fixed, Again Less than two years and 40,000 miles later, I again performed the P401 code fix on our 2001 Honda Odyssey. I was much faster this time. Even better, I completed the trip cycle for all sensors and it passes! Nice. :-) Now, for a quick trip to DEQ. By Brent Logan Longboarder. Blood donor. Photographer. More about Brent. View all of Brent Logan's posts.