Bob: The wiring to the Bk 1 sensor is:

P/O=ing. volt from fuse for heater circuit.

Bk/Lg=power ground

Gy/Lb=44 at PCM term.-signal .2-.9V engine in closed loop at 1500 rpm

Gy/R=46-signal return for O2's as well as other sensors.

Bk2 wiring is:

R/Bk... Login to read more.