So my check engine soon light came on this morning so I went down to the Auto Zone to see what it was.
PO133. Slow Response (heated oxygen sensor bank 1, sensor 1)
That is the front left O2 correct?
I have the back two eliminated with the MIL's from my O/R X.
Auto Zone has the OEM sensor for $46.99. Should I just buy a new sensor and replace it?
Also, my car smells like its running rather rich and not sure how to change it. I have a handheld Diablo Tuner.

Input is much appreciated!