common problems? lol

lubrication problems that destroy turbos,
for the warranty on a new turbo:
new injector seals/refurb`d injectors
remove sump and replace oil pump
clean oil galleries throughout engine
replace oil filter
replace turbocharger and all oil pipework

EGR issues
wiring issues
ECU issues
and waterpumps just like like this one

other than that the Pug engine is a good little unit