Keep the exact code
Copy an option code exactly, including leading zeros and letters. Keep its accompanying description beside it. A short code is not a universal equipment vocabulary: do not assume that a similar-looking code on another make or model has the same meaning.
Turn the description into a question
When wording is unfamiliar, ask what the feature actually does in that vehicle. Does the description refer to a complete function, a component or preparation for additional equipment? Avoid expanding an abbreviation from memory when the distinction matters to your decision.
Separate identification from operation
A factory equipment description can help you identify a feature to inspect. It does not demonstrate that the feature currently works. Find the relevant control, ask for a demonstration and note any warning or unavailable function. Keep an unexplained code marked as unresolved rather than converting it into a confident claim.
Make a small working glossary
Create a short table with the code, the wording, your plain-language question and the result of your check. Retain the original wording when adding your own explanation. This keeps your interpretation visible and makes it easier to revisit a mistake. If you later write a sales description, include only the function you have established; do not present an uncertain interpretation as confirmed equipment.