Oxygen Sensor - Service Engine Light

I have a 2003 SLT with 84K miles. The Service Engine light came on this week so I had a checked at Auto Zone. The code indicated a bad Oxygen Sesnor. The OEM part is $60. Is there anything besides the Oxygen Sensor I should check or is it as simple as replacing the part? If I replace the Oxygen Sensor I assume I'll just unhook the battery cables to reset the engine light?

Thanks,
Tony

What was the code? No way to advise you without it.