FourStroke | OBD2 Elm Scanner 4+

OBD Bluetooth & Wifi Toolkit

Mike Morawski

Designed for iPad

    • 4.6 • 750 Ratings
    • Free
    • Offers In-App Purchases



FourStroke is a powerful tool that analyzes and displays real-time vehicle sensors and data through your vehicle's OBD2 port, a port standard on most vehicles across the world. Use of this app requires a third-party OBD2 Wifi or Bluetooth BLE Adapter. Our app is FREE to pull and clear engine codes along with most other functionality!

FourStroke can convert your device into a heads-up display of just about every sensor your car supports, without needing expensive gauges. Sensors include RPM, coolant temperature, vehicle speed, air flow, O2 sensor data, and more (sensor support varies based on vehicle).

Quickly diagnose a check engine light (CEL) by pulling up exactly what error codes are present. FourStroke automatically turns the code into a readable description. Your vehicle also may store 'Freeze Frames' that detail what sensor data was present when the CEL first occurred; FourStroke can display this information for you.

In-app purchases are available for reading more advanced sensors as well as a performance upgrade for fully unlocking our dynamometer (horsepower & torque reader) and a 1/4 mile analyzer.

DISCLAIMER: This app requires a third-party OBD2 adapter. Like most other applications, this app does NOT support ABS codes or proprietary commands.

What’s New

Version 7.3.0

- Addition: LELink OBDII BLE adapter compatibility

Ratings and Reviews

4.6 out of 5
750 Ratings

750 Ratings

denver christian ,

Simple. Works every time.

I’ve used this app for years. A 2005 Subaru, 2011 Odyssey and today on a 2012 Tahoe. WiFi connects to my OBD 2 fob, I check codes, figure out why a CEL, clear codes and wash rinse repeat until I get whatever’s broken repaired. O2 sensors, evap system, you name it. Saves a trip to the parts store to have them check the codes for me. Sometimes they won’t even clear the codes for me. Keep up the good work and please keep up with the Apple updates so this app will continue to work! Thanks for a great tool.

Developer Response ,

Thanks, a good reminder for me to look at setting aside a few weeks coming up to get another good update out :) Its awesome to hear how much this has helped you and how well it has worked with your vehicles! I appreciate the review!!!

InkyMyCat ,

Fantastic App

I love the app as it’s constantly being updated and the author cares about peoples concerns. I’ve been using this app for a few years now on my Honda cars as well as a few of my friends cars to find problems.

I support the app and always buy any upgrades to help the author. I look forward to future updates. I’ve misplaced my module and will have to buy another one once I research which one to buy.

Developer Response ,

Thank you, it means a lot! I will do my best to continue delivering more improvements over the coming months!

IvanTheMeh ,

So far the best OBD II app

I’ve tried several of these apps with my wifi OBD adapter. I’ve tried several in app purchases as well. So far this is the one that has given me what I needed. Much appreciated. Thanks for keeping it up to date! Worth the download and the in app purchase.

App Privacy

The developer, Mike Morawski, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy.

Data Not Linked to You

The following data may be collected but it is not linked to your identity:

  • Usage Data

Privacy practices may vary, for example, based on the features you use or your age. Learn More

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