OBD2 Diagnostics - Read and Erase Error Codes with Real-Time Sensor Data

Piston puts your vehicle's diagnostic information right in your hands.

Is your Check Engine Light (MIL) illuminated? Transform your smartphone into a professional diagnostic tool to read error codes and view Freeze Frame data - the crucial sensor readings captured when the problem first occurred. This helps you pinpoint and resolve issues faster.

You'll need an ELM327-compatible Bluetooth or WiFi adapter (sold separately) that plugs into your vehicle's OBD2 port. Our intuitive app guides you through the pairing process, with step-by-step instructions available from the Home screen after installation or anytime via Settings.

Key Features:

Read and reset standard OBD2 diagnostic trouble codes (DTCs)
View critical Freeze Frame data captured at the moment of failure
Monitor live sensor data streams in real-time
Check emission system readiness status
Maintain a local history of all diagnostic scans
Cloud storage option for your diagnostic records*
Interactive sensor data graphing
Export real-time vehicle data to files
Retrieve your vehicle's VIN information
View ECU details including active protocols and available parameters

*Premium features require a one-time in-app purchase (no subscriptions)

Compatibility Information:

Piston requires an ELM327-based Bluetooth or WiFi OBD2 adapter (sold separately). The app supports OBD-II (also called OBD2 or EOBD) compliant vehicles including: