Piston

OBD2 Diagnostics - Read and Clear Fault Codes and Access Sensor Data

Piston puts your vehicle's diagnostic information right at your fingertips.

Check Engine Light On?

Transform your mobile device into a professional-grade car scanner with Piston. Read Diagnostic Trouble Codes (DTCs) and Freeze Frame data to quickly identify issues when your MIL (Malfunction Indicator Lamp) illuminates.

Getting Started

Simply connect a compatible ELM327-based Bluetooth or WiFi adapter to your vehicle's OBD2 port. Piston's intuitive interface guides you through the setup process, with instructions accessible from the Home page or Settings menu at any time.

Key Features:

• Read and reset OBD2-standard Diagnostic Trouble Codes (DTCs)
• View critical Freeze Frame data showing sensor readings when faults occurred
• Monitor real-time sensor data streams
• Verify emission system readiness status
• Maintain local and cloud-based DTC histories
• Create visual data charts from sensor readings
• Export real-time sensor logs for later analysis
• Retrieve VIN and detailed ECU information

Note: Some advanced features require a one-time in-app purchase (no recurring subscriptions).

Compatibility

Works with all OBD-II/EOBD compliant vehicles using an ELM327 adapter:

• U.S. vehicles: 1996 and newer
• European petrol vehicles: 2001+, diesel: 2004+
• Australia/NZ petrol vehicles: 2006+, diesel: 2007+

Note: Available data depends on your specific vehicle's OBD2 implementation.

Version 3.8.0 Updates

Latest improvements include:

• Android 14 support
• Enhanced sensor selection interface
• Expanded sensor support (vehicle-specific availability)
• Various stability improvements