I am having a strange problem and am unable to fix it. I am using the same material on two different parts of the car body but one material is showing up lighter than the other. the material looks fine in material preview but problem in rendered view. I have checked the normal, face orientation, duplication, and modifiers, and everything seems right. can anyone help me understand what am I doing wrong here? the only thing I can notice is light and dark blue in face orientation mode but do not know what this is and how to fix it.
You have an array modifier with zero offset:
This leads to overlapping geometry. I've already posted an answer about overlapping geometry here: