The model of the phone used here is Redmi 3S, of which the specific steps are as follows:

1, open the settings page of your Android phone, and directly select My Device to enter.

2, the next step, you need to click on all the parameters.

3, this time, in the kernel version there to click five times in a row.

4, if there is no problem, then select the single test.

5. Inside, make sure to start the engineering mode of the distance sensor.

6, so that there will be a change in the number, for example, the beginning of the state is 63 Away.

7, and so see the final display is not pass after the results, you can detect the distance sensor is normal.