weird shading WHEN use pbr materials

can someone know's how to fix weird shading on this parts.

this only happens when i use PBR materials.

when i go to blender, the shading on this parts not perfectly shades with other parts.
can someone help me how to fix this...

 

You should check the face orientation of that fender, it looks like that could be some inverted normals. In the modeling window of blender, check this option and see if it's red.

If it's red, open up Edit Mode, select all the red faces, then go to Mesh -> Normals -> Flip

 

thank you