2000 Cadillac STS PO 155 O2 sensor heater circuit malfuncti

I am showing P0155 as a failure with the bank 2 sensor 1 O2 sensor, this one be the one in the front bank exhaust manifold. If you changed the one in the rear manifold, closest to the firewall, and more than likely serviced from the top, that was bank 1 sensor 1. I do believe however, that they are the same sensors, so if you haven't roughed up the one you removed, you can reuse it. A simple way that I have found to check these, is to check the resistance of the sensor heater element, it would be across sensor terminals c and d. The corresponding harness side wires would be pink(D), and brown(C). I don't have a spec range, but it should not be open circuit, which the failed ones usually are.