had exactly the same problem on my Saab. Put up with problem for ages and then couldn't take anymore! Try drying them out with a hairdryer and lubricating the joints as moisture/poor contacts could be the problem.
If that doesn't work then i suspect one of the sensors is faulty (which is most likely if they are all clicking) I got a £20 replacement on flebay. Just swap them with the new one, one at a time, until you find the culprit.
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