o2 sensor check engine light

96 lumina 3.1, I changed the secondary o2 sensor, the one after the catalytic converter, had the code reset, but still get the inopertive trouble code, and check engine light, The fuse powers a lot of other things so thats ok. Cost about $75 for the Bosch sensor, I looked at the wiring, it appears to go straight to the computer, with no other connectors except for the one at the sensor

check to make sure all the wires arent melted or fused together, or arent shorted out to anything.