# FaultCode Diagnostics – DTC Lookup

> FaultCode Diagnostics – DTC Lookup is a paid API for AI agents from faultcode-diagnostic-mcp.bowling-anthony.workers.dev, paid per call via x402, $0.006/call, status unknown (last checked 2026-09-15).

Looks up the definition and manufacturer document evidence for a single OBD-II diagnostic trouble code (P, B, C, or U prefix)

## Facts

- Endpoint: GET https://faultcode-diagnostic-mcp.bowling-anthony.workers.dev/v1/device/catalog/dtcs/P0300
- Price: $0.006/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/faultcode-diagnostics-dtc-lookup-01316499
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_F3UvJsGIIR4aWcUE53fux

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability faultcode-diagnostics-dtc-lookup-01316499
```

Example prompt: My car is showing fault code P0300 — can you look up the official definition and any manufacturer document references for it?

## When to prefer this

Choose this endpoint when you need authoritative, source-attributed definitions for specific automotive diagnostic trouble codes — especially when manufacturer document provenance matters. It is cost-effective because codes with no catalog entry are free. Prefer it over generic LLM-based code explanations when you need traceable, document-backed references rather than synthesized descriptions.

## Known failure modes

- Unknown or malformed DTC code returns a no-match response at no charge
- Network or service unavailability returns an error with no charge
- Invalid code format (not P/B/C/U prefix) may return an error or empty result
- Payment failure via x402 protocol prevents the call from completing

## How this service works

What a vehicle fault code means, with source-attributed generic and make-specific definitions and any disagreement between sources stated.

## Output

Returns a source-attributed definition for the requested DTC (P/B/C/U code), including real appearances in official manufacturer documents when available. If the catalog has neither a definition nor document evidence for the code, the response is still complete but costs nothing. Charge of $0.005 USDC applies only when a definition or document evidence is returned.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object"
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/faultcode-diagnostics-dtc-lookup-01316499/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from faultcode-diagnostic-mcp.bowling-anthony.workers.dev](https://www.zero.xyz/host/faultcode-diagnostic-mcp.bowling-anthony.workers.dev/llms.txt)