With secret codes, you can run hardware diagnostic test on your OnePlus and Oppo phones. Both the have lot of interesting features for you to uncover, but to get the features you need to perform certain actions or access a particular menu on the phone using special code. You can use secret codes to access hardware diagnostic test on Oppo and OnePlus handsets.

Here is how to run hardware diagnostic tests on OnePlus and Oppo handsets using service code. Dialing the service code will enter your OnePlus and Oppo into service mode or engineering mode. In this mode, you can diagnose Wi-Fi problems, back and front camera issues, flashlight issues, check battery charging, Bluetooth, Gyroscope, Proximity sensor, GPS, LCD brightness issue, see usage statistics of your phone, and many more, but with caution. Making unwanted changes are dangerous.


If you are an interested person, just dial the code *#808# in the phone app, you can access hardware diagnostic mode or engineering mode on your OnePlus runs OxygenOS and Oppo runs Color OS handsets and then perform a variety of tests.

Run Hardware Diagnostic Tests on OnePlus and Oppo phones

*#801# - Engineering switch test mode
*#802# - Enter automatically engineering TTFF GPS test mode
*#803# - Enter engineering network test mode
*#804# - Automatic disconnect test mode
*#805# - Engineering Bluetooth test mode
*#806# - Engineering aging test mode
*#807# - Enter engineering test mode
*#808# - Enter manual engineering test mode
*#809# - Enter engineering echo test mode
*#888# - View hardware pcb version
*#900# - Test photograph RGB

Note that you can also create shortcut on the home screen for individual test using Nova Launcher or Action Launcher 3. If you are using any of these launcher, just go to Widgets > Activities > and then scroll down to Engineer Mode. Select required test mode.

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Kannan is a computer and Android enthusiast, a blogger by passion and a tech freak. His always ready-to-help attitude, knowledge and hard work is what drives him.


  1. All these test a f-in useless and doesnt tell you anything. If it runs ok it work, if it doesnt then “something” is broken, but you will not know exactly what because it will not give you a log.

    utterly useless.

    My brand new oneplus 5 has problems with one of the camera sensors on the rear and will not work at all. So when running the test it just shows black screen and will not finish the test at all. Ok, what does this tell me that I already didnt know? Absolutely nothing.

    How they all boast about android being the tech gurus phone, well its not. Its the wannabes phone that cant do the simplest things like back up full data and restore without a huge hassle even..

    Get an iphone if you want simple and high tech at the same time.

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