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Bank 2 sensor 1 Air fuel sensor heater circuit. This sensor is NOT an O2 sensor, though it operates like one and in the same location(in exhaust stream). Basically the PCM detected that the heater circuit was drawing excessive amperage or no amperage. Usually it's a bad a/f sensor and replacing it will fix it, however, it doesn't rule out the possibility of damaged wiring or an open in the power or ground circuit, or a short in the power or ground circuit.
O2 sensor are located before and after Catalytic Converter ( exhaust system of your car).
If you car's engine is 4 cyl you have 2 O2 sensors and if you car's engine is 6 cyl then you have 4 O2 sensors ( for each bank, 2 for left bank and 2 for right bank).
Hope it helps and comment if you need more advice.
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B1 means the sensor is located on the same bank of the engine that has the #1 cylinder. B2 is located on the opposite bank.
S1 means the sensor is located BEFORE the catalytic converter
S2 means the sensor is located AFTER the catalytic converter
You didn't say which engine you have, so I've included the diagrams of both 4 cyl and 6 cyl so you can see the banks
Bank #2 referes to the side of the eng in which cyl. #2 is snsr #1 referes to the sensor before the cat. conv. and the code is for a slow response so, basically a lazy O2 snsr. So if you can locate cyl. #2 and follow the exaust manifold on that side of eng. the very first O2 snsr you see is the one in need of diag./repair
There should be two O2 sensors. If you look inbetween the engine and radiator following the exhaust manifold down to the exhaust pipe you should run into the 1st O2 sensor, following the pipe down stream under the vehical towards the catalytic converter you should find the second O2 sensor. The 1st O2 should be easy but the 2nd might be difficult depending on your abilities. Coils will depend on 4 or 6 cyls, 1 for each cyl. Repair man, go to, pep boys, napa, auto zone, advanced auto parts to name a few.
po304 is just that #4 cyl has a problem could be a bad spark plug or a bad plug wire or bolth if it hasnt had an ign tuneup its time. the po138 is just telling you one of the cylinders isnt burning all the fuel put into that cyl. so its just cause and effect. if ya need any more info let me know later paul