KustomDiagnostics scan tool
Plug an ELM327-compatible adapter into the car's OBD-II port (under the dashboard), turn the ignition on, then connect. On a computer use Chrome or Edge with a USB adapter. On an Android phone use Chrome with a Bluetooth LE (BLE) adapter; older Bluetooth adapters that need pairing in phone settings will not show up. iPhone browsers can't connect to adapters. Works with cars that have a standard OBD-II/EOBD port: most European-market petrol cars from about 2001 and diesels from about 2004, and US cars from 1996. Older or grey-import cars may not answer.
OBD-II scan tool
Computer: Chrome or Edge with a USB ELM327 adapter. Android phone: Chrome with a Bluetooth LE (BLE) OBD-II adapter.
Reads standard emissions data only. It does not program or change anything in the car, apart from clearing fault codes when you ask it to.