DTC P0031, P0032, P0051, P0052 A/F Sensor 1 Heater: Wiring Diagram: Notes
WARNING: This page is about a different car, the 2007 Nissan Maxima. However, it is still accessible from the selected car via links, so may be relevant.
For PG-POWER, refer to POWER SUPPLY, GROUND & CIRCUIT ELEMENTS .