Need a new oxygen sensor, failed smog.
 

I need a new oxygen sensor for my 1994 geo prizm. Any brands to avoid?
I failed smog because the car was running rich at 71 ppm HC (40 max,) with 0% Oxygen, .27% CO, and 33 ppm Nitrogen oxides.

I don't know about your particular car but NTK make high quality sensors, they're a branch of NGK spark plugs.