Many moms and dads have difficulty recognizing the difference between a deliberate, strong-willed teenager with High-Functioning Autism (or Asperger's) and one who is simply trying to cope with the traits of the disorder. Clearly, there's a range between the usual rebellious behavior of teens versus other (comorbid) mental health issues.
Here are several articles that may help parents to better understand their "special needs" teen:Behavior Problems in Teens with Aspergers and High-Functioning Autism
High-Functioning Autistic Teens and Oppositional Defiance
How To Discipline Rebellious Aspergers and HFA Teens
Imposing Effective Consequences for Noncompliant Teens on the Autism Spectrum
40 Tips for Parenting Defiant Teens with Asperger Syndrome
Parenting Difficult Teenagers on the Autism Spectrum
Discipline for Defiant Aspergers & High-Functioning Autistic Teens