Hi turkey, where did you have your Xtrail checked? did you get a second opinion na? had the same problem with mine too.. swerte lang ako hindi ganun kalala yung problem. turns out na i just had to replace my drive belt since worn out na.
you might want to check this thread out from the xtrail club, might help you din.

http://clubxtrailph.s1.bizhat.com/vi...m=clubxtrailph