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Had similar issues with my R Reg 2.0 RXE Scenic. It turned out to be the temp sensor. when the garage read my
they changed the crank sensor aswell, i suspect though it was a spurious fault on the crank sensor as they either work or they dont.
Temp sensors are thermistors therefore as the temperature builds, their internal resistance reduces. as they fail the internal resistance of the thermistor will (generaly) increase thus sending an inaccurate reading to the managment system. This can be read with a calibrated multimeter (OHMS) and the deflection can be compared to the factory readings which should be listed in the relevent haynes manual. Thermistors are temp dependent so if the performance changes with engine temperature it is a good indication that the component is breaking down.
Hope this helps mate.
Currently in chris scenic's garage:
1998 renault megane scenic 2.0 RXE