Today's vehicles are heavily equipped with computers and sensors, which require additional time to properly diagnose and identify the underlying cause of an issue.

The standard initial diagnostic procedure (typically covering the first hour of testing) consists of: 

Concern verification & Test Drive 

Full System Scan 

Visual & Basic Inspection 

Technical Service Bulletin (TSB) Search 

Targeted Testing: Utilizing tools such as Digital Volt Ohmmeter, oscilloscopes (for CAN bus) Diagnostic Standards by DTC Fault Trees