I have a 2002 honda accord,that has a code of p1259, p1491 and p0401
Model : accord
a diagnostic test
OK is this a 6 or 4 cylinder?
Ok the p1259 is a vtec code either the oil is low or the Vtec solenoid and Vtec pressure switch are bad.For the P1491 and P401 you will need to repalce the egr valve and clean out the ports to fix this issue.These are the next steps of what needs to be done to fix these issues.Hoped this helped.Positive feedback and bonuses greatly appreciated.