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No, going by the service manual your P0172 must've came before the P0442. Although a big part of the P0172 code is determined with the purge on.
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Cliff Scott
2004 Alero GX w/sport pkg - Sold, living somewhere in WI now.
2011 Saab 9-5 Turbo4 M6
2004 Corvette Convertible M6
1994 Chevy Beretta - Quad4/M5
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