> ## Documentation Index
> Fetch the complete documentation index at: https://docs.buildwithdani.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Live data & diagnostics

> OBD-II USB adapters supported by AutoIQ and driver tips.

AutoIQ works with OBD-II USB adapters that use standard protocols (e.g. ELM327-compatible, or direct J2534). Bluetooth/Wi‑Fi adapters are not supported in the current desktop version.

## Supported adapter types

* **ELM327-based USB** — Most USB OBD-II dongles that emulate ELM327 (e.g. CH340, CP2102, or FTDI serial chips) are supported. AutoIQ talks to them over the virtual COM port.
* **J2534 pass-through** — If your adapter ships with a J2534 DLL, AutoIQ can use it when configured for that device. Check the adapter’s documentation for J2534 support.

<Tip>
  Prefer adapters that expose a single, stable COM port and have a signed or widely used driver. Avoid the cheapest no-name dongles; they often have flaky firmware or drivers.
</Tip>

## Driver tips

<Steps>
  <Step title="Install the adapter driver first">
    Before plugging in the adapter, install the driver from the manufacturer’s site or the CD/download that came with the device. This reduces “unknown device” or port conflicts.
  </Step>

  <Step title="Note the COM port">
    After plugging in, check **Device Manager → Ports (COM & LPT)** and note the COM port number (e.g. COM3). In AutoIQ, select this port when connecting.
  </Step>

  <Step title="If the driver is unsigned">
    Windows may block unsigned drivers. See [Install on Windows](/autoiq/install-windows) for options (e.g. temporary disable of driver signature enforcement for trusted hardware only).
  </Step>
</Steps>

## Troubleshooting

<AccordionGroup>
  <Accordion title="Adapter not in the list">
    Ensure the driver is installed and the adapter is plugged in. Restart AutoIQ. If it still doesn’t appear, try another USB port or cable; some cables are charge-only.
  </Accordion>

  <Accordion title="Connection fails or times out">
    Turn the vehicle ignition to ON (engine can be off). Ensure the OBD-II port has power. Try a different COM port or baud rate if AutoIQ allows manual selection.
  </Accordion>
</AccordionGroup>

## Next

* [FAQ](/autoiq/faq)
* [Changelog](/autoiq/changelog)