Join Date: Mar 2007
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I had this once on a front wheel. It would occasionaly show a fault. In this case it was the sensor loose in the wheel. Checked it by jacking up the car and rotating the wheel and it could be heard rattling around. However probably not the case with your as it seems to be related to wet weather.
Currently in ns.thomson's garage:
Rover in Garage, Grande Espace 2.2 Initiale on Drive