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Welcome to the forum. Possibilities can include a bad earth for the dash and a fault with the dash. You could also check the bulbs on the dash are ok. If you go for a replacement dash be aware that the car will adopt the mileage of the dash or the ecu, whichever is highest, so if a replacement has more miles on it than your car, then the car will adopt the higher miles, even if you put your old dash back. Haynes do a workshop manual for the Xsara Picasso which is worth getting and explains how to remove the dash and to replace its bulbs.