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how can I fix my depollution faulty on peugeot 407 diesel?

I have a peugeot 407 se hdi 2005. the Depollution faulty warning is appearing. I have read/heard this is a common fault with various ways of fixing. Would like to know the right way to fix it. Also is this a common occurrence and is it likely to happen again
Richard, April 2011
Probably the EGR valve needs a thorough clean out.

ChicksFan, April 2011
link Click here to see other fixes for Peugeot.