bank 1 describes the sensor that covers the bank containing cylinder #1 or an engine with only 1 upstream sensor. Whether your code is for upstream will be specified as sensor 1 (upstream, before cat) or sensor 2 (downstream, after cat).
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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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