Hi Bhavika,
I had a 52 reg 3 door Cdti lovely car and at 63000 miles I was travelling down the M11 and the engine cut out in the outside lane EEEEKKKKK! .It was obviously 3000 miles outside of the warranty, but took it to main dealer who replaced the turbo under warranty no quibble. I would say that from your description thats exactly what the issue is.What kind of guarantee/ warranty did you get from Cargiant? Maybe worth a trip back to them for any claim.
Good luck Rich
