The other night everytime I turned the car to "on" the 20amp MPI fuse would blow, $20 in fuses later I narrowed it down to a really nasty looking 02 sensor plug on the car side of the wire harness. I cut the sensor plugs off and used but connectors to temp fix the problem, but the o2 sensor is still not giving me any voltage and my engine check is on. I'm starting to beleive some wires for the o2 sensor have burned up somewhere under the dash because while I was trying to trouble shoot the problem I got some smoke from under the dash at one point.

The car seems to drive fine without the o2 sensor now and from previous experience running without the o2 sensor did not really effect much. what is the worst thing that can happen without the o2 sensor??? performance, gas milage????