The Chaos Walking Trilogy --- Patrick Ness; the characters are 14-yr-olds. Poison --- Chris Wooding UnWind --- Neal Shusterman; anything by Neal Shusterman is usually awesome. The Homelanders series --- Andrew Klavan
Acceleration --- Graham McNamee The Curse Workers trilogy --- Holly Black Feed --- M.T. Anderson The Last Book in the Universe --- author of Freak the Mighty
Confessions of a Murder Suspect --- James Patterson; also wrote Maximum Ride series Teen Inc. --- Stephen Petrucha; pretty funny Struck By Lightning --- Chris Colfer; not too much cursing Divergent --- Veronica Roth
I have many more, but these were the first ones I could think of. Mostly---if not all---have teenage characters.