[ohitzme]

So i just bought a 2000 maxima se and life was good. Until 2 days ago i go to drop my friend off and i am coming home and whamm.. service engine light comes on. I was hoping it was either the gas cap or my cold air intake became lose again. Check them both and nothing. So i try disconnecting the battery and still came back. So i went to get it checked out and it came back with code p0139, which is a bad o2 sensor in bank 1 sensor 2. The guy there said he didnt know if it was after catalytic front or after catalytic converter back, and there is a huge price difference and honestly i cant afford to buy both. So does anybody know if it is front or back for code p0139. My car is a 5sp manual the mechanic said that made a difference.