# Shared Features: DTC Database DTC information is stored in a separate database in Vehicle Spy. The DTC Database is simply a text file that lists the DTC number followed by the description of the problem. For an example, see the short list below. Once all the entries are made, save the file with a \*.TXT extension in the DTC folder located in the Vehicle Spy 3 directory. B0123, Loss of Serial Data B0124, Start Switch Circuit Fail --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://docs.intrepidcs.com/vspy-3-documentation/3.9.16/shared-features-in-vehicle-spy/shared-features-dtc-database.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.