Keep the first version
There is a tempting button on many diagnostic apps: clear faults. Before touching it, save what is already there. A later scan cannot necessarily recreate the original conditions, and a workshop may need information that seemed unimportant on the first screen. Treat the initial report like a photograph of a problem before anything has been moved.
Save the complete report if the tool allows it, rather than selecting only the code that sounds familiar. Include the vehicle identity, date, mileage, module names and any status shown beside each entry. Check that the saved file actually opens. A screenshot containing the first half of a long description can be less useful than the exported report.
Give the report some context
Add a short note about the reason for scanning. Perhaps the car hesitated during an ordinary journey, or a warning appeared after recent work. Record what happened before the scan, whether the engine was running and whether anybody had already reset the system. Those details prevent a later reader from assuming the report describes an untouched vehicle.
If your reader offers freeze-frame information or readiness status, preserve those screens too. They are different kinds of evidence: one may describe operating conditions around a recorded event, while another describes whether particular checks have run. The available information varies with the vehicle and tool. A blank field is not a reason to invent an explanation.
Decide what an erase would achieve
Clearing fault memory should have a purpose within a diagnostic or repair process. It is not a substitute for finding the cause, and the absence of a warning immediately afterwards does not establish that the car is healthy. Some information may need suitable operating conditions before it can be recorded again. Follow model-specific guidance rather than an internet reset ritual.
Keep an untouched copy of the original file and label any later scan with its own date. If you share it with a garage, send the observation note alongside it. Remove personal details before posting a report publicly. For an urgent warning or unsafe behaviour, arrange help; preserving a report must never delay getting out of danger.
