yes, bank 1 sensor 2 IS the sensor in the y pipe. There are 2 before the precats in the manifolds, then 2 lowers( 1 in the y pipe and the other very visible after the precats in the front exhaust manifold).

99 SVTC, T-Red, #652/2760-12.8.1998 Mother#@%@!* did I sound abstract? I hope it sounded more confusin than that!