For a 4cyl 1996 accord, their is a good overview here. P401 Engine code on an Accord and on Youtube: http://www.youtube.com/watch?v=d8N-SE047VY Unfortunately it turns out for a 1998 accord, they redesigned the system. Luckily it looks like the answered it here: How to clean out the EGR system in a 1998 accord The image above has the port that must be cleaned out circled. Looks like you take off the intake, and use some carb cleaner to clean out the port.