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407 1.6 diesel
my engine warning light stays on with a message saying, "depollution system faulty" -

would changing the filter cure the problem
 

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I think he means the fuel filter :)

As above anti pollution/depollution fault is NOT a fault its a message and the real reason could be a whole host of things it needs plugged into a computer to read faults AND other data to decide the reason.
 
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