P401 and P404
February 27th, 2013, 5:25 AM
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P401 and P404
Anyone know what would cause a P401 and a P404 OBD II to show up? My tech had replaced my gas cap after he put it on a smoke machine. He said the filler neck grommet was leaking a little but shouldnt be a aproblrm. Well I think its a problem. My question is...wouldn;t a EVAP leak at the fille rneck set of a small EVAP code as well?
