As a shade-tree mechanic, I am rather frightened of doing repair work that involves disconnecting or replacing sensors in general.
One of my fears goes like this: I hear stories of people performing repairs on cars. During the repair, they disconnected a sensor of some kind, and after finishing the job, reconnected the sensor only to find that the car won't start or is undriveable until some fancy computer that they don't have talks to the car's OBD (or other control computer) and resets the sensor. One such situation like this is replacing the throttle position sensor.
My thinking is that every car out there has some way to reset the OBD (or other control module) to factor conditions. Sure, the car's computer may have to re-learn a few things, but a factory reset should get the car back to startable and driveable, provided that every other aspect of the repair went correctly.
Is my thinking above correct?
I realize that my question is based on paranoia and lack of experience, and probably oversimplifies and mis-states many aspects of late model cars. Also, I am trying to avoid giving any examples that are specific to a make or model of car because I'm trying to generalize this question to all cars.