bernie (newboy) so bought kkl leadset and downloaded fiat Multiecuscan(.com) from website told me o/s rear wheel sensor faulty .following the wire to its plug socket under the wheel arch protector found that one wire had disintegrated as it entered the car side.
fished it out into the passenger compartment striped plug down resoldered new length of wire in with heatshrink over join, put it all back sucsess!!!