I have just replaced my speed sensor on a 1998 Scenic 1. It is placed on top of the gearbox, and can only be accessed from under the car. The plastic sensor has three wires connected to it. It may have a retainer pin that is keeps it in place, pull this out and the lift the sensor out. If it has no pin, simply pull it out.
My sensor was actually OK, it worked fine, when I spun the little pin at the end of the sensor, it showed up on the speedometer. However the plastic connector in the gearbox is damaged and does not turn. Renault tells me that this little plastic pin is not sold seperatly! I am not going to replace the gearbox, only to get the speedometer working!
morten
January 2010