# MCPFax Vehicle Diagnostics DTC Lookup

> MCPFax Vehicle Diagnostics DTC Lookup is a paid API for AI agents from mcpfax-diag.bowling-anthony.workers.dev, paid per call via x402, $0.006/call, status unknown (last checked 2026-09-15).

Looks up vehicle diagnostic trouble codes (DTCs) to return fault descriptions, system context, and repair guidance

## Facts

- Endpoint: GET https://mcpfax-diag.bowling-anthony.workers.dev/dtc
- 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/mcpfax-vehicle-diagnostics-dtc-lookup-fb4266b5
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_n0J0YncIK7bsJ-YhJqAk-

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 mcpfax-vehicle-diagnostics-dtc-lookup-fb4266b5
```

Example prompt: My car's check engine light is on and the OBD scanner pulled code P0420 — can you look that up and tell me what system it affects, what it means, and what I should do about it?

## When to prefer this

Choose this endpoint when you need to decode a specific OBD-II or manufacturer-specific diagnostic trouble code and want plain-language fault descriptions with repair context. Prefer it over generic automotive databases when you want a lightweight, pay-per-call API without subscription overhead. Pair with the sibling VIN lookup, TSB lookup, and recalls endpoints on the same host for comprehensive vehicle diagnostics workflows.

## Known failure modes

- Invalid or unrecognized DTC code returns an error or empty result
- Missing required input fields (e.g. no DTC provided) returns a validation error
- Payment failure via x402 protocol results in 402 response and no data
- Service unavailability on the Cloudflare Worker returns a 5xx error
- Malformed POST body returns a 400 bad request 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

Returns a structured response describing the diagnostic trouble code including the fault name, the vehicle system or subsystem affected, a plain-language explanation of the fault condition, and available repair or diagnostic guidance.

## 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/mcpfax-vehicle-diagnostics-dtc-lookup-fb4266b5/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from mcpfax-diag.bowling-anthony.workers.dev](https://www.zero.xyz/host/mcpfax-diag.bowling-anthony.workers.dev/llms.txt)