What causes an obd2 codes p0401 and p0300 on a 2001 Honda Passport if you already clean up the egr valve and passage how you can fix it?
== == First off Your Honda is really an Isuzu Rodeo, but you already knew that. These have the GM electronic egr. if you have the 3.2 motor. The only way to fix it is to replace the egr valve.