If you cant find resolution here to your Routan problem and there arent alot of posts here you need to go to chryler or dodge forums to get your answers. I had a P1404 problem that been going on intermittently for a couple weeks and just today my routan started blowing smoke under hood and I had to pull over and I saw antifreeze dripping all over the place. Long story short the forums plus UTUBE videos enabled me to make the repairs needed and I saved hundreds of dollars doing the work myself. Had a bad EGR assy and a Y connector on heater hoses sprung a leak that was hard to detect. Parts store persons say this is common on chrysler minivans alng with the fact these vehicle consume lots of oil, mine a quart per 1000 miles.