I bought a 2006 Focus 1600TDCI 110 with a relative’s help at a car auction. It was cheap at £4,000 because it had 139,000 miles on the clock. It came from Leaseplan and had been doing journeys from Braintree to Edinburgh. It has full and comprehensive service history. After 6 weeks good driving (about 800 miles) it lost some power on inclines and the dashboard showed up an engine system fault. We took it to our local Ford dealer and after carrying out tests he found the diesel particulate filter defective. He replaced this and regenerated the system, cleared fault codes and road tested. He then replaced a split turbo boost resonator. The repair cost £1,075. Upon picking it up he advised that the engine power is down but could find no fault when checking it on the computer and recommended I run it for a few days then bring it back and see if anything showed up. I did this but no fault showed. The garage thinks the turbo could be on the way out and says it will cost a lot, so advises running the car as it is. The car is certainly drivable and the only problem is getting that bit of oompf from it on inclines but I find it very frustrating. We can’t afford to change it. I do not believe the garage is deliberately trying to cheat us but it still has the same problem I took it in for, except the dashboard does not show an engine systems fault. Have you any advice?