I'm trying to determine if the Ford dealership damaged my MAF sensor, (Ranger 2.3 2002 4x2) when fixing a heater hose leak. I picked it up and about 15-20 miles later got a CEL and was also running rough. Took it back in and they said the MAF sensor which they replaced. I think they broke it,but not sure. I'm trying to figure out if they did break it, would the code have been set immediately?

 

MAF codes are usually 1100-1104 or 0100-0104

Self test code would be set pretty quick, 100 or 101, this would be a circuit problem, not a performance problem.
Performance problem takes a while to set because computer needs a baseline to compare to "normal" performance.