How can I fix my Renault Megane 53?

Renault megane 53 petrol. Warning light flashing on dash for toxic fume filter system. Loss of power.
What should I check and how would I get it resolved?
Andrew Lineham, March 2008
Had the same on my 04 megane, Renault traced it to a faulty ignition coil. Cost £100 to fix!

Emma, May 2008
link Click here to see other fixes for Renault Megane.