2001 LS
One should be on the "header" pipe near the "tunnel" where you would stick your arm to get the oil filter out.
the secondary o2 sensor should be on tail end (after the catalyst) of the cat.
not on B-pipe.
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DB Squad
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2016 BMW 340i M-Sport / 2013 Chevrolet Volt / 1999 Subaru Impreza RS EJ205