I have recently had a new reconditioned engine fitted in my partner, its 1.6 hdi. About 2 weeks later my turbo started whing and approx 2 weeks after that I had the inner core of turbo replaced. For about a week after that is was fine, running well but then the engine started during oil at quite a fast rate and smoking with acceleration. Now the mechanics ate saying their supplier won't issue another turbo under warranty as its the catalytic converter that's needs replacing. I am clueless when it comes to engines, does this sound correct? Can the cat converter be checked to see if its partially blocked and therefore the cause of the problem? Or is the burning of oil the problem. I've already spent £2500 and as you can imagine a bit reluctant to spend more but know that needs must!