Pulled Code 013 (OBD1)

[xbornkilla2k4]

i just scaned for DTCs on my 94 Grand Prix 3.1L there is one code, 013 which is o2 sensor. any body know if the 94 grand prix has only one sensor? i have looked passed the cat. and i dont see one, i only see one on the exaust manifold. is it possible to not have a post cat. sensor?

[bszopi]

They didn't go to 2 sensors until OBD2, so 96. You will only have the single 1 in the rear exhaust manifold.