it's in the exhaust manifold
Bank 2 sensor 2 is the second sensor down from the exhaust manifold on the radiator side of the engine.
Bank 1 is the bank next to the radiator. Sensor 1 is screwed into the exhaust manifold.
The bank 1 sensor 1 oxygen sensor on a 2002 Honda Accord is located on the header. It is right next to the sensor circuit.
3, sensor 1 bank 1, sensor 2 bank 1, sensor 2 bank 2
It is located right by the catalytic converter and should be fairly easy to swap out. It is located right by the catalytic converter and should be fairly easy to swap out.
Underneath the gas tank
That would be the O2 sensor after the catalytic converter.
O2 Sensor malfunction, Bank 1, Sensor 1
Driver's side, after the catalytic converter.
Bank 2 sensor 1 (Air fuel ratio sensor)
For a Honda it will be the sensor on the exhaust manifold that is closest to the radiator ( transverse mounted engine ) for normally mounted engines it would be on the drivers side.
That means that your o2 sensor is stuck lean (bank 1 sensor 1)