How To Reset Ambient Temperature Sensor?

Ambient temperature sensors behave abruptly after continuous usage. Usually, the sensor starts malfunctioning and does not have exact outputs. In such situations, we need to reset them, by finding them which are present as Mode buttons, which allow us to do so. Before pressing any button, it is necessary that we know the perfect way of how to reset ambient temperature sensor so as to be clear, what shall happen after the resetting.

Let us first know what is an ambient temperature sensor, how does it work, when and how does it fail, and to properly reset it or replace it according to the condition of the sensors.

What Is An Ambient Temperature Sensor?

Ambient air temperature sensors are internal sensors present inside or just beside the bumpers below, which measure the temperature outside of the car. They control the interior temperature by providing automatic HVAC systems. It is a negative temperature coefficient (NTC) sensor whose resistance decreases when outside air temperature increases. It takes the resistance as input, to control the inside temperature and the blower speed.

Requirement Of The Reset:

Hence, when it does not gives an accurate reading, we detect some fault and it needs to be resolved with quick action. Before it becomes necessary to get replaced then it becomes mandatory for us to learn how to reset ambient temperature sensor and do the needful.

How To Know When A Sensor Fails:

It is the ambient temperature sensor’s duty to keep noting the temperature outside of the car. For this, it takes a reference point and takes the signal, monitors and maintains the cabin temperature. But when the sensor fails, it alerts the driver by giving some predictions with the help of which, the driver can start inspection to the issue.

Below are the reasons which came across normally when a sensor fails:

1. Stopping Of The AC Auto-Mode:

If the sensor fails to provide the data of the external temperature, the auto mode of the AC unit will not work properly or might not work at all. Failure of the AC auto mode will not generate any reference point to base the automatic calculations and thus no continuous cycling will occur to keep the cabin cool. Thus, here comes a necessity to know how to reset ambient temperature sensor so as to prevent issues in between a journey.

2. Interference In The Input Signals:

Unusual mixed-type input signals to AC will reflect an issue in the sensors because of which temperature imbalance may occur resulting in unreliable heating inside the car. The automatic function of the AC system plays a direct role but leads to inconsistent cooling if the sensors face problems with signal interferences.

3. Malfunctioning Of The Temperature Gauge:

We may also get to know the situation of temperature sensors by continuously checking the temperature gauge of the vehicle. Incorrect reading is displayed if the sensor fails to measure the exact temperature of the outside environment. Also, the gauge or the indicator’s reading might be off by few degrees which may interfere with AC system functions, and thus the sensor needs to be replaced without much delay.

4. Improper Fuel Pressure:

If incorrect signals are being produced from the ambient temperature sensor, it may lead to unusual fuel pressure management. Suppose, there comes a situation when the engine is hot but due to incorrect signals, it displays cold resulting in the consumption of more fuel. This causes a negative impact on fuel economy and engine performance.

5. Turning On Of The Engine Lights:

If the check engine light gets illuminated, it indicates to the driver that the vehicle needs immediate repairing. It is one of the major signs to take into account, as it is a warning signal of resetting the sensor as soon as possible so as to function properly.

6. Heating Due To Cooling Fan:

To remove the heat from the engine coolant, fans are located beside the radiation grille which gets activated by the received signals from the sensors. If a situation arises where the fan receives false signals, it doesn’t get activated leading to overheating of the engine and thus needs to be checked and replaced if required, so as to prevent any accident from happening.

7. Shakes In Low Speed:

If the fuel mixture starts adjusting accordingly, which usually when there is a fault in the sensor, the vehicle starts shaking or vibrates at low speed which results in power losses and other unusual behaviors.

8. In-Operative Clutch:

Performance issues arise when input problems in the scan tool or in the multimeter take place. If the compressor clutch gets engaged with the scan tool, there is some problem with any of the inputs.

We need to verify any suspicions if it had occurred with the visual inspection of the sensors and its connector. Before that we need to verify the manufacturer’s specification with a multimeter, to test the sensor.

Depending upon the condition, we first have to know how to reset ambient temperature sensor which suffices in saving money over uninstalling and reinstalling with an upgraded new sensor.

How To Reset Ambient Temperature Sensor?

It is usually recommended to reset the temperature if it continuously shows malfunctioning and ambiguously heats the engine. Below are some of the tactics mentioned so that one knows exactly how to reset an ambient temperature sensor in a proper manner:

1. Positioning The Sensors:

The first thing is to locate it in a perfect position so as to reach the device with not many difficulties. Generally, it is located in the front position. by doing this, it becomes easy and we can then move onto the next step.

2. Removal Of The Battery:

After that, we need to disconnect the power source by removing the battery and uninstalling the device by attaching the sensor to the vehicle wiring with the help of a plastic clip. Everything should be done with care, so as the wiring or the system doesn’t get compromised.

3. Resetting Of The Sensor:

Now comes the main step, resetting the sensor. We need to locate and press the reset button on most ambient places. For accuracy, dust present in the system must be cleaned after unplugging so as to prevent the sensor from any interference.

4. Installation Of The Equipment:

After resetting, we need to attach the clip again as before and place it exactly where it was before. Once done, we need to test the sensor whether it’s working properly or not.

5. Matching Data With Real-Time Application:

Lastly, we need to match the data by matching or synchronizing it with a real-time application. If the sensor is normal, it will show the exact reading, i.e. the temperature which will be outside.

Thus, one can easily get to know how to reset the ambient temperature sensors by taking into account any of the above methods.


So, by this, we come to know how generally an ambient temperature sensor gets outdated as the possibilities mentioned above are the only ways by which it starts showing issues. Also, by following the above step-by-step procedure, we get completely acquainted with how to reset ambient temperature sensor when it shows ambiguity.

Thus, in all, it is suggested to replace the sensor and not to reuse the old one if it gets broken or outdated, as it will help in avoiding any major issues occurring in the middle of any journey. For any queries outside of this article, do write to us in the comment box, will cover them also in further actions.

Safe Driving

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