Obd Mary – OBD2 car scanner

Contains adsIn-app purchases
66.7K reviews
Content rating
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About this app

Obd Mary is a car diagnostic scanner, gauge dashboard and trip computer with a number of cool features.

1. You need ELM327 Bluetooth or Wi-Fi adapter to connect to a vehicle using this application.
2. Your vehicle can contain some ECUs (electronic control modules), so don't forget to check all ECUs.
3. ELM adapters version 2.1 are often can be corrupted, so try to choose version 1.5 if you have a chose.

Quick start guide

1. Download the app
2. Plug in ELM327 adapter into 16-pin diagnostic connector in your vehicle
3. Switch ON ignition
4. Discover your Bluetooth ELM adapter in your Android device settings
5. Select discovered ELM327 adapter in the app settings
6. Try to connect!


You can read and reset trouble codes from OBD2 compliant control units. Can see fault codes descriptions and search it in internet just by click. Freeze-frame data can be read in case if DTC is activated. You can read live parameters like speed, RPM, MAF, coolant temperature.


Use our OBD2 app as a gauge dashboard. Create your own set of gauges. You can customize approximately all gauge parameters(sizes, colors, positions of stroke, arrow, texts, labels, backgrounds and etc.) Resize and move gauge in edit mode to desired place just using your fingers. Enjoy your style!

Trip computer

Track your trips with our Obd Mary app and ELM327 adapter. Keep the adapter connected all the time inside your car and the app connects to your vehicle and log your trip data:
- trip time;
- fuel consumption;
- fuel cost;
- average speed;
- max speed and etc.

Full version

Buy the full version of the Obd Mary app and get full functionality without an ads. When you are buying the app you support future development and support. Thank you.

Contact developer: Fill free to contact us using appropriate button on the main app screen. Use email channel.
Updated on
Jun 5, 2022

Data safety

Safety starts with understanding how developers collect and share your data. Data privacy and security practices may vary based on your use, region, and age. The developer provided this information and may update it over time.
This app may share these data types with third parties
Location, Personal info and 4 others
This app may collect these data types
Location, Personal info and 4 others
Data is encrypted in transit
Data can’t be deleted
66.7K reviews
Bobby S
November 18, 2020
The app would not connect to the ECU without data... I have two Galaxy j7s, same exact model, so I put this app on the one without data to act as the scanner and it would time out every time... Tried it on the phone with data and it connected right away... What gives? ALSO: It will read the codes but you can only see 1. The others are hidden unless you pay. The free app 'Car Scanner' pulled all mine for free and it's easy to export to text file. Avoid if you are just looking to pull CEL codes.
38 people found this review helpful
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Jaybiz Fpv2020
November 4, 2020
Works like a charm and it's simple to use! I have other more expensive apps that do more but are a pain to get setup! This app is just as good if not better because it's streamlined and everything is ware you expect it. I have the unpaid version but for 8 bucks it sounds like it will do more than the $35 apps. So far it does everything I need some I'm happy!will buy the paid when finished typing this
39 people found this review helpful
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wobbly woz
July 20, 2022
Tried another app that failed to recognise my VW so thought initially it was probably the Bluetooth dongle is bought. Pleased to try this which just connected and worked immediately. No error codes showing before long European trip which is great and will have with me to try and trouble shoot any issues
2 people found this review helpful
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What's new

We express our support to the Ukrainians, the price for the full version has been reduced
Minor changes on main screen UI
Fixed Freeze Frame data
Fixed some bugs