Piston (OBD2 & ELM327)

The OBD II diagnostic application.

Clockworkbits · com.clockworkbits.piston

Not rated yet 1M+ downloads v2.1.3 2.8 MB Android 4.0+ PEGI 3 · Everyone

Download APK 2.8 MB All versions

Signature matches the Google Play version Details

At a glance

Latest version: v2.1.3 (213)
Updated: Aug 2, 2026 (2 months ago)
APK size: 2.8 MB
Requires: Android 4.0+ (API 14)
CPU support: Any (no native code)
Category: Auto & Vehicles (app)
Listed since: Aug 23, 2022 (at least)
Permissions: 8 (1 sensitive)
Developer contact: [email protected]
Privacy: Developer's privacy policy

About this APK

Piston (OBD2 & ELM327) is an app by Clockworkbits in the Auto & Vehicles category, listed since at least August 2022. It has no native code, so it runs on any Android processor.

It asks for 8 permissions, 1 of them sensitive: approximate location.

What's new in v2.1.3

• Improvments in Bluetooth Connection stability • Improvments in establishing WiFi connections • Bug fixes and improvements

Description

From the listing uploaded by “appupdater”.

Piston is the OBD II diagnostic application designed with the simplicity in mind. The application is capable of: - reading the live data - showing the fault codes and clearing them - displaying the logged freeze frame data The application requires the OBD II Bluetooth or WiFi dongle (ELM327 based) to communicate with a car. All the popular OBD II protocols are supported: - J1850 VPW and PWM - ISO 9141-2 - KWP 2000 - CAN (11 and 29 bits - both 250 and 500 kBit/s) If you have any request, comment or suggestion, please don't hesitate to contact me.

Security & authenticity

Security rating: Trusted

Signing certificate

Signature matches the Google Play version Checked by the source store on Aug 2, 2026.
Certificate issued to “Marcin Gierlicki” This is the certificate of the Google Play version.

Store checks and file details

Developer signature under review Aug 23, 2026
Validated against Google Play Aug 2, 2026
Signed byCN=Marcin Gierlicki
Signing certificate (SHA-1)DB:6F:74:4B:E5:51:4A:4E:0E:C4:20:31:1C:55:2B:A1:69:96:B0:50
File MD584dfbbff2c7825180ef0c4b48fa77af5
Uploaded by “appupdater” Gold tier · 117,810 followers · uploading since 2020

Scans and ratings come from the source store; the certificate comparisons are AAPKs's own, made from the files' published signatures. AAPKs doesn't scan files itself — compare the MD5 and signer after downloading.

Permissions (8)

Piston (OBD2 & ELM327) requests 8 permissions, 1 of them sensitive.

Approximate location Sensitive android.permission.ACCESS_COARSE_LOCATION
Bluetooth android.permission.BLUETOOTH
Bluetooth admin android.permission.BLUETOOTH_ADMIN
Full network access android.permission.INTERNET
Prevent the device from sleeping android.permission.WAKE_LOCK
Run at startup android.permission.RECEIVE_BOOT_COMPLETED
Run foreground services android.permission.FOREGROUND_SERVICE
View network connections android.permission.ACCESS_NETWORK_STATE

Required hardware & features

Bluetooth android.hardware.bluetooth
Basic touch input android.hardware.faketouch
Location android.hardware.location