Wrong Texture/Mesh for Imported Collada Model

I’m new to Blender. I’m trying to import a collada model. The model is a car from several meshes. When I render it the top of the car mesh is rendered ok, but the one from the sides look strange. The same it looks in the 3d view.

I looked at the materials and I’ve tried to play with them without success. When I change in the problematic mesh the shading to flat, the model looks good in 3d view but still looks wrong when rendered.

I even tried to remove all the material still something seems to be wrong so I assume something is different with the mesh, but I can’t tell what. I compared the properties in the good and the bad meshes and I couldn’t find any difference.

Could you tell me where to look and from where the bad aspect comes?