This is my programmer/code reader, so it should give chrysler codes.
But the interwebs say Heater Resistance Bank 1 Sensor 3. It should come back on if something is legitimately wrong though, right? I mean, it's an O2 sensor so either way I'll get to it when I get to it, but still...
This definitely applies to you. If it stays off I wouldn't worry about it but if it comes back on or you notice it running rough or worse gas mileage then I would worry about it.
'91 Bronco 351w, ZF5, D44 TTB, 9" rear swap with disk brakes, 37" toyos, method wheels, mastercraft seats, A/C and heat