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how can I fix my car and what is causing the problem?

207 Gti......depollution system faulty....car lost power....has only 56000 kms.....
thando NW, March 2013
you could try giving the motor a good long run in lower gears with high revs to get the exhaust really hot and try and burn off excess deposits in your exhaust system

cdc, March 2013
link Click here to see other fixes for 207.