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OBD-II Adapter diagnostics

Test what the browser can see. Know when it cannot.

Check Bluetooth, USB or serial connection capability where the adapter exposes it, while vehicle diagnostics and code interpretation must use reliable automotive procedures.

Run these first

Relevant live checks

Bluetooth LE Browser TestOpen the browser Bluetooth chooser for compatible Bluetooth Low Energy devices in supported environments.
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Web Serial Port TestChoose a serial port, open it at a safe test baud rate, and close it to verify browser-level serial access.
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WebUSB Device TestRequest a compatible USB device through WebUSB and display the browser-exposed manufacturer, product, vendor, and product IDs.
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Browser Hardware Feature CheckSee which hardware-facing browser capabilities are available before trying camera, gamepad, MIDI, USB, HID, serial, or Bluetooth diagnostics.
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First diagnostic sequence

Do the high-signal checks before risky changes

  1. 1

    Verify the adapter supports the intended transport and protocol

  2. 2

    Use ignition and connection instructions from the adapter maker

  3. 3

    Do not clear safety-critical codes merely to turn off a warning light

What DeviceOK/browser can help check
  • Request supported BLE, serial or USB devices in compatible browsers
  • Show whether the browser can open the selected transport
What this browser page cannot prove
  • Guarantee compatibility with every ELM327-style adapter
  • Safely command vehicle modules generically
  • Replace a professional scan tool or repair manual