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The outside temp sensor is probably located in one of your wing mirrors. One of the wing mirrors will have a small bump protruding from it. This is your temp sensor.
Not sure if you need to take the mirror glass out or just the wing mirror back (the colour coded part) off to get at it. It will need changing though. It shouldnt be an expensive thing to get from Renault.
Hope that helps you out.
Currently in dave_mezza2006's garage:
2014 Vauxhall Astra Limited Edition 1.4 16v VVT Turbo