The heater in my det o2 sensor went short circuit on mine once. I figured this out on the side of the road because it was blowing my ignition fuse. I cut the heater wire and drove it daily that way for the next 2 years.

I'd convert the harness to use a generic delco 4 wire sensor from a commodore.
Wires are signal, ecu ground, chassis ground and 12v.
The commodore ones fit in the same de/det exhaust manifold.