CrankKey reference / scan-tool limits
What a Basic Generic OBD-II Scan Tool Can—and Cannot—Tell You
A basic generic OBD-II scan tool can show generic stored powertrain codes, standardized powertrain data, and readiness status. Depending on the tool, pending codes and available freeze-frame information may also be shown. A result is evidence—not a diagnosis, root-cause finding, safety verdict, or guaranteed repair.
Generic readers can miss enhanced codes, ABS, SRS, transmission, body, and HVAC modules, plus bi-directional controls and relearn procedures. Preserve the scan record and use vehicle-specific service information or professional diagnosis before replacing parts.