P0150 and P0050 codes, what O2 sensor to replace?

[jimmyducati]

Right in the middle of a 1000 mile road trip the SHO started to buck and feel like it was missing during while just cursing down the highway. It finally threw a couple codes, P0050 and P0150..
P0050 is HO2S Heater Control Circuit
P0150 is O2 Sensor Circuit Malfunction (Bank 2 Sensor 1)

I know one of the 4 O2 sensors is likely bad, but auto zone doesn't sell them by bank, but by upstream/downstream, left and right. Does anyone know witch 02 sensor needs to be replaced, or have a part number?

 

[glock-coma]

I believe the front of the car is bank 2 and sensor 1 is the upstream


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[glock-coma]

Usually the side of the engine with the #1 cylinder is bank 1