# Faultcode Diagnostic MCP – Vehicle DTC Lookup

> Faultcode Diagnostic MCP – Vehicle 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 2026-09-14).

Returns source-attributed generic and make-specific definitions for a vehicle OBD fault code (DTC), including any disagreements between sources.

## Facts

- Endpoint: GET https://faultcode-diagnostic-mcp.bowling-anthony.workers.dev/dtc
- Price: $0.006/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/faultcode-diagnostic-mcp-vehicle-dtc-lookup-caf6b4da
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_ycY-Mtc97gGroEkNiVcen

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-diagnostic-mcp-vehicle-dtc-lookup-caf6b4da
```

Example prompt: My car is showing fault code P0420 and it's a Toyota Camry — can you look up what that DTC means, including any make-specific info and whether sources disagree on the definition?

## When to prefer this

Choose this endpoint when you need authoritative, source-attributed DTC definitions with explicit conflict detection between generic OBD-II standards and manufacturer-specific interpretations — especially useful when diagnosing make-specific issues or when you need to know if sources disagree rather than just getting a single definition.

## Known failure modes

- Unknown or non-standard DTC returns no results or an empty definition
- Missing or malformed fault code query parameter causes a 400 error
- Very rare or proprietary manufacturer codes may only have generic definitions with no make-specific data
- Network timeout or upstream source unavailability returns a 5xx error

## 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

A structured response containing the generic OBD-II definition of the requested DTC, any make-specific interpretations sourced from relevant databases, source attribution for each definition, and an explicit statement of any disagreements or conflicts between sources.

## 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-diagnostic-mcp-vehicle-dtc-lookup-caf6b4da/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)