Bank 1, sensor 2, downstream O2 sensor.
Nissan:
Frontier (all trims)
NV1500, NV2500, NV3500 (all trims)
Pathfinder (2005-2012)
Xterra (all trims)
Suzuki:
Equator (2009-2012)
The sensor is designed for vehicles with a 4.0L V6 engine (4.0L 3954CC V6 GAS DOHC Naturally Aspirated).