Bad rendering with shadows and facets Its not the first time I render a model but now I have 2 problems as you can see.
The "shadows" on the door for example and the spoiler of the car which is not smooth (even if smooth button is selected).
Catmull-Clark modifier is on with 2 subdivisions on rendering.

What's wrong?
thanx
From the pictures given, it can bee seen that the door is a separate object, the reason the there is no smooth transition between the door and the rest of the car is because there is no shared geometry. I would join the two objects together and use loop tools to bridge the geometry together

To enable loop tools go to file ->user preferences -> add on -> loop tools