Hy, guys!

Can anyone tell me, how can I check, if my knock sensor is broken?

Because today I was in a fiat service, and their computer showed 2 errors:
1 - Knock sensor bad
2 - EEprom error

My problem is, that on low revs, the car is very weak.
On higher rews (from 3500-4000rpm) is the car stronger, but no stronger than a simple 2.0 twinspark engine.

Any suggestions?
Thanks!