## Why Diagnostic Depth Matters Not all OBD2 scanners are created equal. A basic code reader only accesses the Powertrain Control Module (PCM) to read generic 'P' codes. However, modern vehicles have dozens of modules, including ABS, SRS (Airbag), Transmission, and Body Control Modules (BCM).
## Calculating Your Needs This tool assesses your vehicle's complexity based on its age and the presence of advanced systems. As vehicles age, they often develop faults in non-engine systems like ABS or TPMS. If your car is equipped with these systems, a basic scanner will be unable to see the codes that trigger dashboard warning lights.
## Choosing the Right Scanner - Entry Level: Suitable for basic check engine light diagnostics on standard vehicles. - Mid-Range: Necessary if you need to read ABS/SRS codes or perform basic maintenance resets (like oil lights). - Professional: Required for bidirectional control, sensor calibration, and deep module diagnostics.