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Hello, my name is***** you for the question. If the lights were not on prior to then it more than likely occurred during the repair. If the rear of the vehicle was not touched though then I cannot see how you would need all 4 sensors. Most of the time if you are not experienced with these vehicles you will damage the sensors or simply forget to hook them back up. Did he ask work on the rear?
Yes, he would have had to at the very least move the front sensors when working on it. If he did not disconnect them then he could have stretched the wiring and caused a failure. I have never seen all four sensors go bad at once on any vehicle.