It depends on which diode, but sometimes it can.
There are 3 possibilities: either the battery is going bad, a device is being left on in the car (lights, etc) or an alternator diode is shorted.
when can fix alternator in namibia
To change the alternator on a Renault Scenic or Megane, first disconnect the battery to ensure safety. Then, remove any components obstructing access to the alternator, such as the air intake or engine covers. Next, detach the electrical connections and the mounting bolts of the alternator, and replace it with the new unit. Finally, reassemble any removed components, reconnect the battery, and check the alternator's operation.
Under the alternator, at the bottom.
You need 2016 batteries (3Volt)
NO
beside battery engine bay
Will a Renault Megane V Plate ignition barrel fit a Renault Megane Cabriolet R PLate?
I have a 2005 Megane Privilege and wanted to know what size battery replacement is needed for the key fob
Yes there is a coolant sensor in the Renault megane.
how to change Renault megane timing belt
The quickest fix for electronic items is rebooting which is accomplished by turning them off and on again. The Renault Megane Scenic can be rebooted by disconnecting and reconnecting the battery. A mechanic will typically do this at no charge.