CEL Code 455 and 496
Since last feb. when I got gas siphoned out of my tank my CEL has been coming on and usually staying on. The codes has been the following:
PO455: EVAP System Leak
PO496: EVAP High Purge Flow
My MPG has gone down some. I went from mid 30's to upper 20's.
Any ideas as to what the problem is??? I've put on about 5000 - 7000 miles since then... And at times after getting gas the car runs ruff after starting. But this is only a 1 out of 20 things that happens.
I have installed a new fuel filter and AC Delco spark plugs at 70,000 miles before this all happened.
Also, yes I get the Check gas cap msg, but I have since then bought a new locking gas cap ans still get this msg.
Last edited by jim2029; 04-12-2010 at 05:27 PM.
Reason: more info