Bought a 2009 FIAT Doblo 1.9JTD around 4 years or so ago. Got it cheap because the "turbo was knackered" according to the garage.
Got it home, hard to start, idled ok, but revved like a bag of nails inside a bag of spanners in a tin bath...probably
Cost me 53p to fix it
Used my trade in Halfords for a pair of worm drive clips (Jubilee in any other language) and re-attached the intercooler hose. The original clip had rusted through and the pressure from the turbo was clearly escaping which flagged up all manner of faults, management lamp, boost pressure faults, injectors throwing fuel down the exhaust, making it misfire & burn an off white colour.
Same turbo been on it since. However, at 127,000 miles I did eventually require 2 new injectors, but that was due to the previous owner throwing cheap diesel at it, but that's another tale for another day.
Anyway, I had it mapped to an astonishing 170BHP and the hilarity when I blow A3 turbo's, 3.2 V6 Vectra's and Mini Cooper's away from the lights. It's not the speed or the torque so much as the fact people see an ex wheelchair taxi (like a pope mobile) tearing up the road like the drivers arse was on fire, ha ha ha
Anyway, that's my input for what it's worth