Until you start approaching 150K, the O2 sensors rarely fail. ABS sensors at the wheel also seldom fail. Rabbits do not chew wires. Mice seldom chew wires unless they have made a nest around them.
Did your ABS light come on? Or was it just a pulled code? Dirty abs sensors usually are OK after a mile or less of driving, they will store a code, but it requires multiple stores before the light comes on.
O2 sensors seldom fail, unless you were given some off brand name stuff on the cheap. Usually, it is just a vacuum leak.
Time to find a new mechanic. If it is a dealer - darn, look for another one after telling the first why you are moving.

Klaus