Problems With Mesh Please Help

[Sam]

Ok heres my problem, this mainly happens when im doing cars and trying to sharpen up the sides of the headlights or vents but then i get loads of mesh errors and i cant find a way round this please help.

heres some picks to help:-

Heres what i start with a normal headlight smoothed.



And with no smoothing.



Now this is what i would like maybe a little sharper.



And this is what i get when i try to chamber it.



And with no smoothing.



And i quick render to show the errors that i dont want.



And i have also tried doing this.



But i still get the errors please help Thanks.