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Citroën Picasso vibrations - Roger Jones
The August issue of Which? magazine calls for Citroën Picasso owners who experience serious engine vibration because of loose mounting bolts to contact them at Department ANB, PO Box 44, Hertford X, SG14 1SH (which@which.net; www.which.co.uk).
Citroën Picasso vibrations - Ben79
According to the CitroenPicasso.org.uk website, there appears to be a known problem with the lower engine mount, the dealer will replace under warranty.

Ben
On my 3rd Citroen. Saxo, Xsara, C5.
Citroën Picasso vibrations - Roger Jones
WHICH? April 2004 issue:

"Citroën has admitted to Which? that an engine bolt in some of its Picasso cars can work loose, after first downplaying the issue, and will fix them free of charge [even outside warranty]."