Diagnostics are intended to identify likely causes of a symptom before repair decisions are made. Depending on the vehicle and concern, the process may include scan-tool checks, electrical measurements, visual inspection, road-test observations and component-specific testing.
Record symptoms, warning lights, operating conditions and recent service history.
Check visible conditions and confirm the reported concern where reasonably possible.
Use appropriate diagnostic equipment and targeted tests rather than relying on assumptions.
Explain observations, limitations and possible repair paths before additional work.
Customer approval is required before proceeding with separately quoted repair work.
Where applicable, verify the addressed symptom after the approved work is completed.