Piston

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

Transform your mobile device into a powerful car diagnostic tool with Piston – putting your vehicle's health information right in your hands.

Check Engine Light Solution
When that dreaded MIL (Malfunction Indicator Lamp) illuminates, Piston becomes your automotive detective. Our app scans your vehicle's Diagnostic Trouble Codes (DTCs) and captures crucial Freeze Frame data – the ECU's snapshot of sensor readings when the problem first occurred – helping you pinpoint and resolve issues faster.

Compatible Hardware
Simply pair Piston with your existing ELM327-based Bluetooth or WiFi adapter connected to your vehicle's OBD2 port. Our intuitive interface guides you through setup seamlessly – find comprehensive connection instructions available from the Home screen after installation or anytime via Settings.

Core Features

Read and erase standard OBD2 Diagnostic Trouble Codes
View critical Freeze Frame diagnostic data
Monitor real-time sensor information streams
Verify emission control system readiness status
Maintain local DTC history records
Cloud storage option for DTC reports (login required)
Visualize sensor data through detailed graphing
Export live sensor readings for technical analysis
Retrieve your vehicle's unique VIN information
Access ECU technical details including protocol type


Premium Upgrade: Unlock our complete feature set with a convenient one-time purchase (no recurring subscriptions).

Vehicle Compatibility
Piston requires an ELM327-compatible adapter and works with vehicles supporting OBD-II/EOBD standards:

All US vehicles manufactured since 1996
EU petrol vehicles from 2001 onward
EU diesel vehicles from 2004 onward
Australia/NZ petrol cars from 2006
Australia/NZ diesel cars from 2007


Note: Available data varies based on your vehicle's OBD2 implementation.

Support & Contact
Questions? Suggestions? Our team welcomes your feedback at [email protected]

Version 3.8.0 Updates
Latest improvements include:

Android 14 compatibility
Enhanced sensor selection interface
Expanded sensor support (vehicle-dependent)