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Yes there is a coolant sensor in the Renault megane.
Renault Megane Dymanique
at the back
The coolant temperature sensor in a Renault Megane Scenic is located on the right hand side of the engine as you are looking at it. It is located just above the TDC sensor.
It has to be reset by a Renault dealer (or anyone with a Renault Clip diagnostic).
The crankshaft sensor Renault Clio is located on the bottom of the engine, near the oil filter. It is connected to the vehicle's computer and constantly provides information about the position of the crankshaft.
Next to the air filter box
Will a Renault Megane V Plate ignition barrel fit a Renault Megane Cabriolet R PLate?
Could be a bad fuel pump, clogged fuel filter or something in the electrical system is getting overheated like a coil or crankshaft sensor.
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how to change Renault megane timing belt
On a Renault Megane Scenic, the output speed sensor is usually situated behind the gearbox. It can only be felt because it is small and has wires connected to it.