My Z has developed an intermittent fault. the passenger side (I think) seat belt warning thingy activates when I carry a passenger, despite them having the seatbelt on. Is it a common problem? Is it an easy fix? is it worth claiming on the warranty (£100.00 excess). I am unimpressed with the screetchy high pitched tone that it makes to alert you that its knackered...... more your Zastava Yugo than BMW IMHO.