Piston (OBD2 & ELM327)

- October 2, 2015

Everyone

Tools

( 2,738)

Piston (OBD2 & ELM327)- screenshot thumbnail

Description

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.

Reviews

4.2

2,738 total

5 1,642

4 528

3 215

2 111

1 242

James Price

If you want customization for what data is pulled this is a great app. I wanted to be able to see live data for all my O2 sensors and the fuel trimmings. This app was able to put that all on one screen. Very satisfied. Tell me where to go to donate!

Chuk Leung

No Gimmicks , But a practical Basic Scantool If you just want to read and reset fault codes this is the app for U. It connects real fast and tells U the Obd2 fault codes. But there is not much on diagnostics. But then the app is free and you do not even have to pay for an expansive adapter.

Andrew Kennedy

Simple, Fast, And Useful. This app does exactly what I need it to do. It may not be as in depth as other apps, but it works very well. The interface is easy to use. Works well with "Generic Bluetooth OBD2 interfaces". It retrieves and clears codes faster than other apps (torque) IMO. There is even enough to get you started with basic troubleshooting (Fuel trims, AFR, etc..)

Roman S

Good app. Thanks a lot for support! Connected well to my wifi iobd on andriod. Read all errors I wanted to see. I recommend to move Settings button to left floating menu. My respect to developer.

tudor g

Perfect Better than other apps. Now i don't know...to be happy that the app shows no faults or search until a fault comes on ? Time will tell...

David Mullin

1st app that worked with cheapo 327 Bluetooth! I tried 10 or more apps and got *nowhere* with my 2005 Cary. With 'Piston' I am able to read everything *and* was able to reset my 'Check Engine' light! Yay!!

User reviews

James Price January 13, 2016

Chuk Leung January 8, 2016

Andrew Kennedy January 23, 2017

Roman S March 14, 2016

Good app. Thanks a lot for support! Connected well to my wifi iobd on andriod. Read all errors I wanted to see. I recommend to move Settings button to left floating menu. My respect to developer.

Marcin Gierlicki March 13, 2016

It is supported. You have to select the connection type in the application settings.

tudor g December 7, 2015

Perfect Better than other apps. Now i don't know...to be happy that the app shows no faults or search until a fault comes on ? Time will tell...

David Mullin May 1, 2016

Eddie B October 21, 2015

Fantastic APP!! If you dont get a VIN or some other data, please understand that not all cars provide everything such as VIN. especially on EU or UK vehicles. This is not the apps fault! Keep up the good work dev!

David D'Haene February 24, 2016

Piston connects every time. The interface does exactly what I want it to do. It will tell me things about my car that I never thought to ask. Consistently reliable. Easy to use.

Brendan Collins April 1, 2016

Great app did exactly what I wanted Worked with igeek WiFi ODB2 adaptor straightforward reads live data and faults. Easy to work out I loaded it on my android tablet.

Jason K November 13, 2015

Almost perfect Clean ui and works well. Just need the ability to reorder and customize the live info screen, and some more monitored variables (esp. Fuel econ). I prefer it to torque. The ability to plot selected items over time would be great.

Jimmy J July 20, 2016

The best obd2 bluetooth scanner Very easy to use on Golf GTI, no ads and the live vehicle data is like no other (especially to check if the alternator is charging). If this app was able to CUSTOMISE options in the car (like Carista) it would be incredible and I would be willing to pay a one-off fee for it. Love how it's easy to use and free. Thanks for such a good app.

E.W. C October 21, 2015

Free and neat UI I love this app. But it cannot be completely closed and will prevent other OBD app to get data. I have two apps just in case. Hope this will be solved.

Omar Finjan October 4, 2015

The best one on google store I have tried several apps , this one is the best, simply to use , works very well . Thanks guy, i hope you guys will be able to improve the app in future so it would be able to read airbags codes

Kent Noetico October 18, 2015

Reliabile and dependable Just like some other users have noted; this app is solid and reliable; connects quickly, displays nicely and simply works. Simple interface and good features. Use it!

Grant Lilley April 5, 2016

Superb Free, and very reliable. Was able to diagnose through generic elm327 Bluetooth to Samsung Galaxy Note 3. Plus able to delete faults with ease.

Louis van Rensburg December 12, 2015

This is THE ONE Just add some theming and a way to get fuel level and you have the perfect obd app. Its not bloated and connects with my Bluetooth elm straightaway no questions asked.

Tamas Raduly March 26, 2016

This was the only app that was able to read the error code for a 2015 Ford Focus ST. I had tried Torque, OBD Auto Doctor and E OBD2 before with no luck. I used it with a PLX Devices Kiwi 2 scan tool.

Wilson Brenna December 8, 2015

Excellent Works well on 4.4.4, elegant interface. The only things I could ask for are to open source or to log live data to csv.

Aaron Traynor March 26, 2016

Great app, some minor improvements One of the best OBD2 reading apps I've seen. Could you please add an option to have imperial measurements with °C as the temperature for UK users? Thanks :)

Brett Haas January 28, 2017

Easy setup. No BS. Quick selections. No brainer to use this app... Update- the for dummies version for OBDII. This app's for grease monkeys, positively love it. Do more nerdy apps!!

Bruce April 6, 2016

Excellent. Works every time, clean interface. WiFi connection capability (which not all android apps have). I've tried 6 or 7 OBD2 apps, paid and free, and this is my favorite.

December 7, 2016

Prosta i użyteczna aplikacja Robi dokładnie to co powinna, bez wodotrysków, reklam i innych udziwnień. Brakuje mi tylko możliwości zmiany kolorystyki (szare litery na jasnym tle nie zawsze są czytelne) oraz zapisywania danych live do pliku.

UkicT8 July 20, 2016

The best of its own By far the best app for reading obd2 codes. It's the fastest, easiest, fool-proof (-iest) yet

Jason Ninios March 21, 2016

doesnt support enough pids raw interface data log is neat though

ADN P. March 22, 2017

Strong and simple ui app really ez to use for not experienced users just great , is there a way throw mode 6 codes? It is possible to add this in this kind of app? Thanks in advance

Arty Dragon October 6, 2016

Free and works great. Also has cleanest GUI of all the others Bought a $20 adapter from amazon and can now read and reset check engine codes. Used a veepak bluetooth adapter and was on an Audi A4. S5 running marshmalllow. Also connects incredibly fast.

Mitch Kennedy December 20, 2016

Fantastic Mate, thank you for a free and functional diagnostic app. Dose what it says,love how it works with obd Wi-Fi and bluetooth scanners. If your in Sydney please allow me to buy you a case of beer for your efforts A1app.

Irakli Baitish March 29, 2017

Great program. I have a audi a6 2009 tdi and in live data almost nothing is available.would like fuel level.boosy...etc.

Mike Zampello November 2, 2015

Does not work Connects to Bluetooth then immediately disconnects.

marc arcoria October 11, 2016

Garbage I tried it on my 4 cars and all 100 of the cars and trucks at my buddies used car lot the app never once connected to my obd2 dingle when other programs will, this app is a waste of time.

January 15, 2017

Works well Not bad for a free Obd 2 App. I use often with elm bluetooth. Does not work well with BMW though.

Raymond Wong May 1, 2017

Unlike other obd reader apps (torque), no issues to connect to Vgate ELM by bluetooth and require min. authorization to phone. It works and simple to use. GREAT APP!!

adeolu akintunde December 9, 2015

Robust... Simple... Reliable This app is simply the best. Very simple... Uncomplicated and reliable. Connects to Bluetooth faster than others.

Kevin Milam February 7, 2017

I love that this app doesn't ask for access to everything on my phone! It works great. Simple, intuitive interface. Wish it did some graphs, but no biggie.