OPPO phone following dialing codes:

 To access diagnostic tools on an OPPO phone, you can use the following dialing codes: 

• ##4636##: Accesses the testing menu for network and battery stats
• \*#800#: Enters engineering mode for advanced configurations
• \*#3646633#: Performs extensive hardware tests
• ##1472365##***: Performs a quick GPS test
• ##1575##***: Performs a different type of GPS test
• ##0##**: Tests the Android device LCD display
• ##0842##***: Tests the vibration and backlight
• ##2664##***: Tests the Android device touch-screen
• ##0588##***: Tests the proximity sensor
• ##7262626##***: Performs a device field test
• ##232339##***: Performs a device wireless LAN test
• ##526##***: Performs a device wireless LAN test
• ##0289##***: Tests the device audio
• ##0673##***: Tests the device audio
• ##232331##***: Tests the device Bluetooth
• ##0283##***: Performs a packet loopback test
• ##34971539##***: Shows complete information about the device camera
• ##06#*: Displays the IMEI number

You can also perform diagnostics on an OPPO phone by going to Phone Manager > Diagnostics > Continue > Run Diagnostics.