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If the sensor is an infra red one it should look like a dark piece of plastic like the end of a TV remote. Behind which is a small circuit board. On my Clio it is next to the interior light and sunroof control - just slides out with a bit of wiggling or gentle persuasion with a flat blade/screwdriver.
Sometimes just drying it out with a hairdryer and reconnecting it does the trick. If it needs a new one go to a salvage yard (found online these days) or a Renault dealer if you prefer a new one and can afford it.
It should still work with the same key - the code is held by the key and the control unit and engine computer elsewhere.
Make sure you reseal the aerial when you replace it - a squirt of silicone or bath sealant does the job.
Currently in mkmly's garage:
Renault Clio 1.4 RT Auto