Home › Forums › Stay Dirty Lounge › Service and Repair Questions Answered Here › 99 V6 Accord P0401 AFTER port cleaning and EGR replacement › 99 V6 Accord P0401 AFTER port cleaning and EGR replacement April 3, 2012 at 11:00 am #442637 MikeParticipant http://www.tegger.com/hondafaq/tsb/accord/A99-085.pdf This is a tsb article for all Hondas for that year span. It explains the fix. It might help you.