Diagnostic Hotline offers support for all makes and models, foreign or domestic. Callers pay for the support they need, and there is no subscription, signup or fees. Diagnostic Hotline offers instant access to live experts, who draw upon more than 30 years of under-the-hood experience and have access to a state-of-the-art automotive library and symptom and repair database. The specialists walk callers through the most difficult of diagnoses, while helping to increase users' knowledge and sharpen their diagnostic skills.