How to calibrate the proximity sensor on Xiaomi Redmi 9T: full instructions with nuances

Xiaomi Redmi 9T is one of the most popular budget smartphones, but even it can eventually have problems with the proximity sensor. If during the call the screen does not go out when you bring the phone to your ear or, conversely, accidentally locks in your pocket, this sensor is to blame. In 80% of cases, the problem is solved by software calibration, which can be done independently without disassembling the device.

In this article, you will find not only step-by-step instructions for setting up the sensor on the Redmi 9T (model M2010J19SG), but also ways to diagnose a malfunction, alternative methods of solving, and answers to frequent questions. We will examine why standard calibration through the engineering menu sometimes does not work, and what to do in such cases. All methods are tested on current versions of MIUI 12.5-14 and do not require root rights.

Signs of malfunction of the proximity sensor

Before you start calibrating, make sure the sensor is the problem, and here are the typical symptoms of it not working properly:

• 📱 The screen does not go out when talking (leads to occasional taps of the cheek or ear).
• 🔒 The phone is locked in a pocket or palm cover (false positives).
• 🔄 The sensor works “once” – it reacts, then does not.
• 🛠️ In the engineering menu (##6484##) the sensor readings do not change when the hand is approaching.
• 📞 After updating MIUI The automatic screen shutdown function disappeared during the call.

If you see any of these signs, you probably need to calibrate, but first check if it's a protective film or a cover, and if you have tight accessories, they can block the infrared signal from the sensor, and then try to take them off and test the sensor again.

⚠️ Attention: On Redmi 9T If the brightness autocontroller stopped working correctly after calibration, then the procedure was performed incorrectly, in which case repeat it or reset the sensor settings to the factory.

Calibration Preparation: What to Do in Advance

Calibration of the proximity sensor is a simple procedure, but it requires preparation. Here is a checklist of actions that will help to avoid errors:

Remove cover and protective film from the top of the screen |

Check the cleanness of the sensor area (wipe with an alcohol napkin)|

Make sure the battery is charged at least 30 times%|

Close all background applications (especially messengers) |

Turn off the energy saving mode in the settings MIUI-->

It is also recommended to restart the phone before calibrating, which will reset temporary system errors that can interfere with the correct operation of the sensor. If you are using MIUI 13/14, check if the Battery Optimization for Sensors feature is enabled in Settings → Battery → Battery settings. It can artificially restrict the operation of the sensors.

If the problem persists after calibration, you'll need a hardware test.

1. Start the engineering menu with code ##6484##.
2. Select the Proximity Sensor.
3. Look at Value values: when you approach the hand to the sensor, they should change from 5 to 0 (or vice versa, depending on the model).

Method 1: Calibration through the engineering menu (official method)

This is the most reliable method recommended by Xiaomi itself, which runs on all versions of MIUI and does not require superuser rights, but it is important that after calibration, the phone automatically restarts.

Instructions:

1. Open the Phone app and enter the combination: ##6484##.
2. In the engineering menu, select Proximity Sensor.
3. Press Calibrate (calibration).
4. Place the phone on a flat surface with the screen up and wait for the process to complete (usually 10-15 seconds).
5. After the Calibration Success label appears, the phone will reboot.

If there is no Calibrate, then your version of MIUI does not support it, in which case try alternative methods in the following sections.

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After calibration, check the sensor in real-world conditions: call someone and make sure the screen goes out when you approach the ear. If the problem persists, repeat the procedure or try resetting the sensors through Settings → All settings → Resetting the settings → Reset sensor settings (not available on all firmware).

Method 2: Calibration through hidden MIUI settings

On some firmware versions (especially MIUI 12.5 and later), the standard engineering menu may not include calibration options, in which case an alternative path will help:

Instructions:

1. Go to Settings. → The phone.
2. Click 7 times in a row on the MIUI version to activate the developer mode.
3. Go back to the basic settings and open Additional → for developers.
4. Find the option of the Approximation Sensor Calibration (proximity sensor calibration).
5. Follow the instructions on the screen (usually you need to put the phone on the table and wait 30 seconds).

If this item is not available, then your firmware does not support software calibration, in which case you can either reset the settings to factory ones or use third-party applications (see the next section).

From the engineering menu (##6484###)|

Through the settings for developers |

With a third-party application |

Nothing helped - the sensor is faulty-->

Method 3: Using Third-Party Applications

If the standard methods didn't work, you can use specialized utilities. The best options for Redmi 9T:

How to use:

1. Install one of the applications (we recommend Proximity Sensor Reset).
2. Run it and select the Reset Proximity Sensor or Calibrate option.
3. Follow the instructions on the screen (usually you need to put the phone on the table and wait).
4. Reset the device.

⚠️ Attention: Some applications (e.g, MTK Engineering Mode may show incorrect data for Redmi 9T, If after using a third-party utility, the sensor stopped working completely, reset the settings through Settings. → Reset.

What if calibration doesn’t help?

If none of the methods solved the problem, the reasons may be as follows:

• 🔧 Hardware malfunction: the sensor plume or the sensor itself is damaged, often after falls or moisture is hit.
• 📱 Firmware problem: after the update MIUI You could have blown the sensor settings. Try to roll back to the previous version.
• 🔄 Application conflict: Some programs (such as Greenify or Battery Saver) may block sensors.
• 🛠️ Factory marriage: if the phone is new and the sensor has never worked correctly, contact the service center under warranty.

For the diagnostics of the hardware:

1. Remove the back cover (if you can) and check if the sensor plume has moved away.
2. Blow into the sensor area (near the speaker) – if there is no reaction, it is likely that the sensor is faulty.
3. Connect your phone to your PC and check the sensor logs through adb logcat | grep -i proximity (requires knowledge of working with ADB).

On the Redmi 9T, the proximity sensor is located to the right of the front camera, and if you see the glass above it cracked or scratched, it's a 100% hardware problem, and calibration won't help.

Prevention: How to avoid sensor problems in the future

To ensure that the proximity sensor is stable:

• 📵 Avoid tight covers covering the top of the screen.
• 🧼 Regularly clean the sensor area of dust and fat (use a lilac-free wipe).
• 🔋 Do not allow the battery to completely discharge – this can knock down the sensor settings.
• 📲 Do not install “battery optimization” apps that aggressively close down background processes.
• 🔄 After updating MIUI Always check the sensors through the engineering menu.

If you drop your phone a lot, consider installing a protective glass with a cutout under the sensor, which will prevent mechanical damage to the sensor when you fall.

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Calibration of the proximity sensor on Redmi 9T solves the problem in 90% of cases software. If after all the manipulations the sensor does not work, it is a hardware malfunction, and you need to replace the sensor or plume. The average cost of repair in service centers: 800-1500 rubles (2026).

FAQ: Frequent questions about the proximity sensor on the Redmi 9T