It will be the card pete as stated. there are 2 electric contacts that break i think in the upper left corner,last one i had i repaired by squeezing the card together and wrapping some tape tightly around the card until the new card arrived. i have a megane key here which is new but not sure if i can code it into your car as i think they are matched to vehicle when ordered. i can code you a key foc if you are around this area. as stated the reader is plug and play and takes about 30 mins to fit. about £45 from dealer.
sean