OBD Fusion (Car Diagnostics)

OCTech, LLC

In-app purchases

About this app

OBD Fusion is an app that allows you to read OBD2 vehicle data directly from your Android phone or tablet. You can clear your check engine light, read diagnostic trouble codes, estimate fuel economy and much more! OBD Fusion has a ton of features that are used by professional car mechanics, do-it-yourselfers, and users who want to monitor car data during day to day driving. Some of the features include customizable dashboards, real-time graphing of vehicle sensors, emission readiness status, data logging and exporting, oxygen sensor tests, Boost readout, and a full diagnostic report.

Is your check engine light on? Do you want to monitor fuel economy and usage in your vehicle? Do you want cool looking gauges on your Android phone or tablet? If so, then OBD Fusion is the app for you!

OBD Fusion is a vehicle diagnostics tool that connects to OBD-II and EOBD vehicles. Not sure if your vehicle is OBD-2, EOBD or JOBD compliant? See this page for more information: https://www.obdsoftware.net/support/knowledge-base/how-do-i-know-whether-my-vehicle-is-obd-ii-compliant/. OBD Fusion works with some JOBD compliant vehicles and in some cases requires modifications to the connection settings in the app. Please contact us for more information.

You must have a compatible scan tool to use this software. For recommended scan tools, see our website https://www.obdsoftware.net/software/obdfusion. Please note that cheap ELM clone adapters can be unreliable. OBD Fusion can connect to any ELM 327 compatible adapter, but the cheap clone adapters tend to have slow refresh rates and might disconnect randomly.

OBD Fusion for Android is brought to you by OCTech, LLC, the developers of TouchScan and OBDwiz for Windows and OBDLink for Android. Now you can get the same great features for your phone or tablet.

OBD Fusion has the following features:

• Android Auto support. Note that Android Auto does not support dashboard gauges.
• Read and clear diagnostic trouble codes and your Check Engine Light (MIL/CEL)
• Real-time dashboard display
• Real-time graphing
• Fuel economy MPG, MPG (UK), l/100km or km/l calculation
• Create custom enhanced PIDs
• Includes some built-in enhanced PIDs for GM vehicles including engine misfires, transmission temp, and oil temp.
• Multiple trip meters for tracking fuel economy, fuel usage, EV energy economy, and distance
• Customizable dashboards with fast dashboard switching
• Log data to CSV format and export for viewing in any spreadsheet application
• Display battery voltage
• Display Engine Torque, Engine Power, Turbo Boost pressure, and air-to-fuel (A/F) ratio (vehicle must support the required PIDs)
• Read freeze frame data
• English, Imperial, and Metric units that are fully customizable
• Over 250 supported PIDs
• Displays vehicle information including VIN number and calibration ID
• Emissions readiness for each US state
• Oxygen Sensor Results (Mode $05)
• On-board Monitoring Tests (Mode $06)
• In-performance Tracking Counters (Mode $09)
• Full diagnostic report that can be stored and emailed
• Option to select the connected ECU
• Built-in database of fault code definitions
• Bluetooth, Bluetooth LE*, USB**, and Wi-Fi*** scan tool support
• Available in English, Spanish, French, Italian, German, Czech, Greek, Chinese, and Portuguese

* Your Android device must have Bluetooth LE support.
** You must have a tablet with USB host support to connect using a USB device. Only FTDI USB devices are supported.
*** Your Android device must support ad-hoc Wi-Fi connections to use a Wi-Fi adapter.

OBD Fusion is a trademark of OCTech, LLC registered in the U.S.

Ratings and reviews

keeps disconnecting from Bluetooth OBD2 dongle, have used this app for many years but now all the sudden it keeps disconnecting from the dongle. they don't go works with other OBD2 apps but for some reason it quit working with this one. it will connect I'll start to try to read codes and then it disconnects every time. makes it unusable.

⭐⭐⭐⭐ (4/5) OBD Fusion is an excellent technical diagnostic app for monitoring my 2008 Toyota Prius, paired via a Veepeak OBDCheck BLE. It can be finicky to connect if booted in the wrong sequence. It has a steep learning curve and a complex interface. Tracking hybrid data points like block voltages or inverter temps requires a paid "Enhanced Diagnostics" add-on. Still, as a scientist, I find the unlocked tracking resolution and logging granularity to be an excellent analytical value!

I'm using a cheap little plug in to the OBD connector called Dicknos Elm327 mini Bluetooth that I got for 8 bucks from Amazon for two of them and it works better than any other cheap scanner it's a 100% upgrade because now I can monitor the cooling temperature sensor the O2 readings the maff and map readings as well as the catalyst and the EVAP system while all the car is running and it's accurate great app it was worth the $5 thank you

What’s new

- Added enhanced diagnostics for 2025 and 2026 Mazda vehicles.
- Added support for state displays to user-defined PIDs. A state display is a textual value that's mapped to a numeric value (e.g. 0 = "Off", 1 = "On").
- Added support for state displays to digital gauges.
- Digital gauges can now be rectangular and are no longer restricted to being square.
- Made improvements to distance calculations and added a distance calculation method preference.
- Multiple bug fixes and improvements.