what are the solutions to the problem of a m.a.p.sensor failing on a fiat stilo year 02 thanks for help so far

Answer 1

Replace it. There is nothing else you can do.

Answer 2

map sensor = manifold absolute pressure sensor.
Is your car a petrol turbo or diesel turbo?
Wastegate could be loose or disconnected, creates excessive manifold pressure.
Oil in the inlet contaminates the sensor and req's changing.
Check the pipes to and from inlet manifold for security and leaks.
Check the wiring to the sensor, possibly 3 wire connector.
This should give you something to start checking.
Cheers