91. Select these 2 triangles and use the weld (NOT target weld) tool to attach them together :
92. Check the entire model to spot and solve the triangle problem. Now we will make the real grill. First, make a place as me:
93. First bend the right end a little bit. Just create a new polygon and drag it to the interior (see first image) . Then grab these edges (image 2) , hold the shift button and drag them to the interior of the car. Be careful because there is an edge which is not selected.
94. Create 3 more copies of this part, then do the same thing for the vertical ones :
95. At this step we will chamfer this edges and we are done with the grill :