Where is the air filter on a Renault clio 1.5dci?

Easy to find. Remove the large grey plastic cover from the top of the engine, and the long rectangular filter is housed in the black rectangular box on top of the engine.

It's a bit fiddly to try to split the air cleaner housing on the car, it's easier to disconnect the hoses and remove it completely.

The housing splits after removing a a few self tapping screws.

Hope this helps.