Understand the inspection conditions
Ask whether the vehicle was observed at start-up or only when warm, what could be accessed and whether a road test was permitted. Any check that could not be completed should remain clearly identified.
Read observations together
Noises, visible traces, warning lights and electronic information should be considered together. A photograph does not establish the source of a trace on its own. Further investigation may be needed before a conclusion or repair.
Respect limits and safety
Unless specifically agreed otherwise, a pre-purchase inspection is non-destructive. It does not automatically reveal internal wear. Do not carry out checks on hot or moving engine parts; have suitable checks performed by a professional.
This is general reading guidance, not a diagnosis of a particular vehicle. The vehicle and agreed scope determine the service.