P1457 = Unable to pull a vacuum in tank. NDNV definately covered it all. Something is leaking to atmosphere or your purge solenoid and/or associated vac lines are leaking. Pulling a vac on the gas tank must happen during a system cycle or test. Normal condition would be slight positive pressure on the tank. Gas caps have an internal check valve that sometimes don't seat, or they stick or leak.
Joel
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2008 Ody LX family cruiser. 2007 Chevy Cobalt LS econobox. 
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