Geoidea Posted January 16, 2015 Share Posted January 16, 2015 Hi fellow Ford owners, Our car, an S-Max 2L petrol (2009), seems to have developed a fault butthe garage’s diagnostics are far from clear. About 2 months ago the engine warning light came on and the local Fordgarage traced it back to the temperature sensor in the CAT. They could find nofault in the CAT, so one possibility was that the temperature sensor itself wasfaulty. They cleared the alarm and advised us to see how we got on. If the faultcame back soon then they said they would suspect the CAT itself. The car hasbeen driving fine and now 2 months later the engine warning light re-appeared. This time I took it to a completely different independent garage and they confirmedthe warning again came from the temperature sensor in the CAT. They didemission tests and checked the exhaust system and all was confirmed to be OKwith the CAT. However they noted that the car was difficult to start, unless theclutch was pressed in when starting the car. We may have got used to it but yesone usually has to rev it once or twice after starting the engine or otherwisethe rev may drop. And in the first few minutes of driving the rev can go up& down a bit, sometimes causing the engine to race a bit, until the enginehas warmed up when everything seems to be OK. This, they believe is due to the Dual Mass Flywheel not working OK.They hypothesis is that if the flywheel doesn’t work as well as it should thiscan cause unburned fuel to end up in the CAT, then when this ignites this causedthe CAT to report a high temperature. I am no car engineer and with the car otherwise functioning OK it makesit hard to justify spending the quoted £1300 repair for clutch & DMFreplacement. They say there is a possibility that not doing the repair couldimpact the CAT and eventually damage it. Has anybody else come across this problem, first of all of the car not alwaysstarting well, the engine RPM being up & down for a while and getting faultson the CAT temperature sensor? I see no other issues with the flywheel, no rattlingor grinding for example. Many thanks, Quote Link to comment Share on other sites More sharing options...
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