Exhaustion lamp flickers?

my clio2/1.2 exhaust problem indicator lamp (to the left on the dashboard )flickers/stays on and also the engine is kind of lacking power and not working smooth when cold-are the older sparks the problem and if so what tool to use to unscrew them? I did try unpluging one by one spark with engine running and none of them is completely at fault

hey m8, i am just having the same porblems, you have to take it to a garage to get looked at, it isnt something you can do at home or of the internet.

mine has got so bad its only working on 2 cyclinders, and is so soo to speed up even in 1st/2nd year, and der usualy nippy!

hope you fix the problem.