Piston

Diagnose and troubleshoot your car's issues with ease using Piston, your personal OBD2 diagnostic tool. Instantly access vital car information right from your mobile device.

Is that Check Engine Light (MIL) flashing? Piston transforms your smartphone into a powerful car scanner, allowing you to read Diagnostic Trouble Codes (DTCs) and Freeze Frame data—critical information for pinpointing and resolving the problem. Simply connect a Bluetooth or WiFi ELM327 adapter to your vehicle's OBD2 port; Piston provides clear, step-by-step connection instructions accessible from the Home page after installation or within the Settings menu.

Piston empowers you to:

• Read and clear OBD2-standard Diagnostic Trouble Codes (DTCs).
• Examine Freeze Frame data (a record of sensor readings at the moment a malfunction was detected).
• Monitor sensor data in real-time.
• Check the status of Readiness Monitors (for emission control systems).
• Save DTC history locally.
• Save DTC history to the cloud (requires login).
• View sensor data charts.
• Export real-time sensor data.
• Retrieve your vehicle's VIN.
• Access ECU details, including OBD protocol and PID count.

Note: Some features are Premium and require a one-time in-app purchase (no subscriptions!).

Piston requires a separate ELM327 Bluetooth or WiFi adapter. It's compatible with OBD-II (OBDII, OBD2), and EOBD standards. OBD2 compliance is mandated for US vehicles since 1996. In the EU, EOBD was required for petrol cars from 2001 and diesel cars from 2004. Australia and New Zealand adopted OBD2 for petrol cars from 2006 and diesel cars from 2007.

Important: Piston only accesses data your vehicle provides via the OBD2 standard.

Questions or suggestions? Contact us at [email protected].

What's New in Version 3.8.0

Last updated August 2, 2024

• Android 14 support.
• Improved Sensor Selection Screen.
• Support for additional sensors (availability varies by vehicle).