Ferrari 458 Italia Owner's Manual page 59

If immersed in water or mud, it must be replaced.
• Pretensioners must be replaced at regular intervals as indicated in
the "Warranty Booklet".
Important note
All work on any part of this safety system must be performed by
the Ferrari Service Network.
Warning
Removing or making modifications of any kind to the seat belts,
belt retractors and pretensioners is not allowed.
Maintenance work involving strong impacts, vibrations or
heating of the pretensioner area may activate them; vibrations
caused by road bumps will not have this effect.
3
Safety
59