Could the Sensors be connected to their correct plugs but put into the wrong sides? ( IE Left Sensor in Right CAT and Right sensor into left CAT?) If so would that create a Fault?
Only if you cross them over, but you would see that if you take a look, but I doubt if you would have enough length to do what you suggest.
You would have to be a real muppet to do that.
The green and the blue male ends of the sensors are are clipped onto a metal "bridge" which bolts onto the gearbox.
What sides have you got the blue and green sensors going to?
From Memory...Blue is on the Drivers side Green on Passenger side