1999 Nissan Maxima P0161 O2 Sensor Bank 2 Heater Circuit Fault - Solution After Replacement

I have a 1999 Nissan Maxima GLE with a persistent O2 sensor heater circuit fault code P0161. I've already replaced all oxygen sensors, but the P0161 code continues to appear. Any insights or troubleshooting steps for this specific issue on the 1999 Nissan Maxima model?