I have an "R" registration Renault Megane 1.6 Alize. I am having problems using the central locking with the key fob and have also noticed some water coming through where the sun roof is - is this where the central locking sensor is?
I know in the lagunas the central locking sensor at the front of the sunroof on the roof, looks like a small dome thingy, so assuming it's the same in the megans there should be something similar. Seems obvious but I would get the leak sorted asap before it blows the sensor though
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