# Obd Decoder

> Decode an OBD-II diagnostic trouble code (DTC) using the CarsXE API. Use this when a user mentions a check engine light code, DTC, or OBD code like P0300, C1234, B0001, or U0100.

- Skill: `hashgraph-online-awesome-codex-plugins/obd-decoder` (Agent Skill)
- Install (CLI): `npx skillmds@latest add hashgraph-online-awesome-codex-plugins/obd-decoder`
- Raw SKILL.md: https://api.skillmd.com/api/skills/hashgraph-online-awesome-codex-plugins/obd-decoder/raw
- Safety review: pending (external: skill-scanner PASS, skillspector PASS)
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: Integrations & APIs
- License: MIT
- Author: hashgraph-online (https://skillmd.com/u/hashgraph-online-awesome-codex-plugins)
- Updated: 2026-09-21
- Page: https://skillmd.com/skills/hashgraph-online-awesome-codex-plugins/obd-decoder

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When the user mentions an OBD/DTC code and wants to know what it means:

1. Make an HTTP GET request to the CarsXE OBD Codes Decoder API:
   ```
   GET https://api.carsxe.com/obdcodesdecoder?key={CARSXE_API_KEY}&code={CODE}&source=codex_plugin
   ```
2. Present the decoded fault clearly: code, description, system affected, possible causes, and suggested fixes.
3. Add context on severity — whether it requires immediate attention or can wait.
4. If the API key is missing, tell the user to set the `CARSXE_API_KEY` environment variable (see AGENTS.md).