• Piston (OBD2 & ELM327) 1
  • Piston (OBD2 & ELM327) 2
  • Piston (OBD2 & ELM327) 3
  • Piston (OBD2 & ELM327) 4

Piston (OBD2 & ELM327)

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.

Category : Tools

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Reviews (29)

LAU. C. Dec 18, 2021     

App has a simple interface, and is ad-free which is nice, but it's extremely limited in the number of PID's that it can read. All of the supported PID's are related to the ICE. There is no support that I could find for Hybrid system functions like traction battery state of charge, battery/inverter temperature, or power flow. This app is of little use to owners of hybrid vehicles, unfortunately. It's not a bad app, just too limited for what I need for a Prius PHEV.

Pur. B. Nov 11, 2018     

Good app for quick info from a Bluetooth ODB2 reader. Interface is a little clunky at times and doesn't display all the info that other apps might. Overall, I'm happy with it.

Lan. Apr 28, 2020     

Just started using, having trouble figuring it out. Instructions would be nice. I have no check engine light lit up or code at the moment on my truck, maybe that's the problem. Scanned for faults and it just sits there. Seems like is should say no codes found. The function buttons at top of screen are not labled.

wil. c. Nov 11, 2021     

It's missing some parameters that are critical to your engine in live data. Engine oil pressure and oil temp which. Is why I give this app 4 stars other than that it's a good app I use the bafx obd2 bluetooth adapter and the app while driving and my tablet as a instrument cluster

Tim. O. C. Nov 11, 2020     

Very nice and clear UI, I just wish I could log the real time data being displayed too. If that is or was possible, it would be the complete package.

J. M. Feb 13, 2021     

Most often tasks are connect Bluetooth, load faults, clear faults. Would it be possible to make these steps a widget, only requiring one click to do all three?

Pie. S. Dec 18, 2021     

Was easy to use and connect to Bluetooth, plus has more features than the other free ones.

Kam. S. Mar 12, 2020     

One of the few working with all BT dongles and without tons of useless options and ads. Good job.

Bil. C. Mar 10, 2020     

Reads live data immediately. No faults, but was hoping it would share TPMS issue.

Liv. Z. Apr 19, 2022     

I cannot reset codes, light remains lit even it says ceared. How to erase error and turn off light?

Tor. Jun 29, 2020     

Sometimes it doesn't wanna link up, but other than that the numbers are the most accurate compared to other apps I've previously used.

Par. G. Sep 29, 2021     

This is a good alternative app to use with CaRPM OBD2 reader if you don't like theires, it also supports more active PiDs at a time.

LeR. M. Sep 23, 2021     

Great obd software I have some of the paid ones and they are no better... I actually use this since it's more responsive.

Rob. S. May 23, 2022     

At one time this app actually worked, however it no longer connects to my device.

PaP. M. V. C. Feb 21, 2022     

Very good work from the developer, just wish he would update it.

Asa. A. A. Aug 17, 2019     

Simple, elegant and intuitive UI design.

Kod. B. Dec 30, 2019     

It's not working continues to lose connection to phone. Please advise.

Don. A. May 23, 2019     

OBD2 app for bluetooth and wifi devices, simple interface - works!

A. G. u. Sep 26, 2018     

Only app so far that works with cheap Elm327 & Mercedes-Benz w211 om642. Thanks!

Deo. G. Jan 13, 2020     

I love iet , plug and play . For a quick check works perfectly

Lln. L. Mar 13, 2019     

great app. would be so much better if you could save the data.

And. E. Apr 27, 2021     

Great app easy.to read and easy to use.. No adds

Kym. R. Dec 20, 2019     

Good App, no Ads! My apologies, have edited my review accordingly.

Dim. S. Mar 10, 2022     

Great app, a must have in your phone!

The. V. T. Nov 4, 2018     

Love the simplicity of the design

Ore. c. &. e. Sep 22, 2020     

best app , without ad. Only live data

Dav. K. Feb 29, 2020     

One of the best free OBD2 scanner apps.

Rol. Ē. Dec 27, 2019     

Very simple but useful app, thanks.

Rom. R. Sep 7, 2019     

It works very well on al cars