Dr. Prius is an app developed to help professional Toyota/Lexus hybrid repair shop or owners to examine the health of the High Voltage battery. It turns your mobile device into a professional diagnostic equipment that usually cost thousand of dollars, it is being trusted by 253+ professional repair shops around the world.

Dr. Prius perform test and provides access to all the relevant battery information to quickly help identify problems with a simple touch on the screen of a smartphone, do not fall victim to bad battery, test the battery and print the certificate to prove the health of the battery system.

Note: This app requires a ELM327 Bluetooth OBD interface to communicate with your hybrid vehicle, most of the cheap clone ELM327 will not work due to inability to switch between ECUs in your vehicle. Please visit for more detail or feel free to email us for any adapter compatibility question.

Some useful features:

1. Real-time battery monitor with clever charts and numbers.
2. Life expectancy test with proprietary algorithm to find out battery remaining life.
3. Full battery test to run diagnostic on battery system.
4. Print or share test certificate with customer.
5. Read error codes, reset error codes in a breeze.
6. Disable or enable the reverse beep, seat belt beep, adjust battery fan speed and more.
7. Find nearby reputable hybrid repair shop.

Current supported model:
1. 2020 Prius all lineup except 4WD version
2. 2020 Highlander hybrid
3. 2017-2019 Prius Prime Plug-In
4. 2016-2019 Prius Gen4 One, Two, Two Eco, Three(Lithium) and Four(Lithium)
5. 2012-2015 Prius Plug-In
6. 2009-2015 Prius Gen3
7. 2003-2009 Prius Gen2
8. 1997-2003 Prius Gen1 (partial support)
9. Auris
10. Aqua
11. Prius C
12. Camry Hybrid
13. Avalon Hybrid
14. Highlander Hybrid
15. Lexus CT200h
16. Lexus ES300h
17. Lexus HS250h
18. Lexus RX400h
19. Lexus RX450h
20. Lexus GS450h
21. Lexus LS600h
22. Lexus UX250h
23. CHR Hybrid

Any feedback or feature request please reach out to

What’s New

Version 3.3.23

1. Fix voltage bar issue with later model of hybrid

Ratings and Reviews

3.3 out of 5
96 Ratings

96 Ratings

andreacarole ,

Peace of Mind

I started noticing my 2012 Prius battery indicator was never showing full bars anymore. I took it to the dealership but they said they weren’t allowed to do the $160 battery diagnostic unless the warning light was on. “Your battery’s fine,” they said. I downloaded this app and paid $29 for the OBDII thingy (see how little I know about cars and technology?) I found that cell 12 is bad and the battery has a 53% life expectancy. So now I know. Now I have something to base decisions regarding the vehicle. THANK YOU to the developers.

Developer Response ,

Thank you Andrea for the support.

stranger number 2 ,

Somethings fishy

I unplugged the obd2 (carista) and turned the car off and walked towards my door and noticed that the battery bars were still jumping around. What is it reading in real time when it’s unplugged?

Makes me wonder if any of its real or if we have all been duped to a degree.

Please explain how it kept reading voltages when it wasn’t even connected.

Another thing is why not explain what the ideal number ranges should be at?

Why not just have a little range notation or something to let us novices know what we are looking for generally?

Also doing the battery life test, it has you turn on electrical and keep a needle in a green area on your app by adjusting electrical items. Got down to two purple bars before it completed the test.
Then down to one and the red triangle came on. App still said “almost done.”

I had to rev the engine to charge the car. Pushing your battery low is bad right? Seeing the red triangle is bad right?

Well it finally completed thirty seconds to a minute later and it said the battery was fair.

Said the battery was good yesterday.

Went from 78% to 65%

What’s going on here?

It’s a oem battery with 40,000 miles on it.

Developer Response ,

Hi there, most likely you are running the Demo mode.
You will have to have an OBD2 adapter in order to connect to the Prius, feel free to visit my site for more detail


SoloScuba ,

If you have a hybrid get it!

Just bought a new 2021 Toyota Sienna that only comes in hybrid now. Developer has been super helpful getting me up and running. Very responsive. Their website has a comparison of OBD II scanners so you don’t buy one that only allows a dedicated app and/or over spend for one.

Although the Sienna is new, I can establish a baseline now and see future trends that might make me bring it into the dealer. Just knowing the percent of charge on the battery and the charge/discharge amperage has helped me better understand how this hybrid system works.

If I need to get a second run around town car I’m going to buy a used Prius and this app will really help me know the state of the battery on a used Prius. That is VERY valuable information when shopping for a used Prius.

Very happy with this app.

App Privacy

The developer, Big Wheel Tech Inc, 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 Collected

The developer does not collect any data from this app.

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


  • Family Sharing

    With Family Sharing set up, up to six family members can use this app.

You May Also Like