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Not familiar with the vehicle however, if the "d" in "dti" stands for diesel, id check the large fuel filter; usually under the hood (bonnet). Possibly only needs the air bled out -especially if the filter has been changed recently.
could be the cam sensor if it is the eco engine they sometimes don't throw a code up. but the rev amount is limp mode. best to change both sensors at same time cam and crank as they wear out at the same time. egr fault you will have no power and gray smoke pouring out the exhaust and bad smell of petrol.
While your car is running.......pop the hood and find the throttle body. The throttle body is where your air filter tube/hose goes to the engine. Locate the throttle position sensor which should be on the side of the metal throttle body. This should be the item causing this. If you grab the plug that is on the sensor and wiggle it while the car is running then the engine should rev and act up if thats the problem. If not let me know and I can direct you further. Thanks.
first thing to do is change the air filter. even if they appear clean, they can restrict air flow enough to cause problems, especially under power at high revs. if it will still not rev above 3500, then it may be a rev limiter, but try the air filter before worrying about anything else