Mercedes W169 W245 SLK R171 External Air Temperature Sun Load Sensor A1718300072

Mercedes W169 W245 SLK R171 External Air Temperature Sun Load Sensor is an original air conditioning and comfort system component responsible for precise ambient condition readings. Thanks to its factory design intended for specific Mercedes models, it ensures proper cooperation with the vehicle's electronics and stable operation of the automatic climate control. This used OEM component is a sensible choice for service when you want to maintain the correct operating parameters of the system.

Specifications and technical data

• SKU: A1718300072
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A1718300072
• Substitutable numbers: A1718300072, A 171 830 00 72
• Category: Other Air Conditioning & Heating

Sensor function and application

The presented Mercedes W169 W245 SLK R171 External Air Temperature Sun Load Sensor acts as a measuring element for the climate control unit and comfort systems in selected Mercedes A-Class, B-Class, and SLK models. It is responsible for:

• continuous measurement of the air temperature outside the vehicle,
• registration of solar radiation intensity,
• transmitting data to the air conditioning control module,
• influencing the selection of airflow strength and temperature in automatic mode.

Thanks to this, the air conditioning system can maintain set conditions in the cabin in a more stable and predictable manner, which translates into driver and passenger comfort.

Compatibility with Mercedes models

The sensor has been designed with specific Mercedes platforms in mind, which means matched mounting geometry and the appropriate electrical connector. In practice, this translates into:

• easy installation in the factory-intended location,
• no need for installation modifications,
• correct signal interpretation by onboard controllers.

Choosing an original measuring element minimizes the risk of reading errors, dashboard fault messages, and issues with automatic air conditioning operation.

Characteristics of the used OEM component

The offered sensor is a used OEM component, sourced from disassembly, intended for further use after proper installation. Compared to non-factory replacements, it provides:

• electrical compatibility with the Mercedes installation,
• appropriate measurement characteristics,
• consistency with air conditioning control software.

This solution is particularly beneficial for servicing vehicles where it is important to maintain the original logic of comfort systems without interfering with the software.

Installation and operational tips

When replacing the Mercedes W169 W245 SLK R171 External Air Temperature Sun Load Sensor, it is recommended to:

• check the condition of the wiring harness and connector for corrosion and damage,
• install in the location provided by the manufacturer, without changing the position relative to the airflow and sunlight,
• after installation – verify temperature readings and air conditioning operation in automatic mode.

A correctly selected and installed sensor allows for stable operation of the air conditioning system across a wide range of weather conditions, which is important both in summer and winter.

Related components and technical knowledge

If you are planning a comprehensive repair or upgrade of the comfort and air conditioning zone in your Mercedes and need other elements from the same group, such as additional sensors, control modules, or installation elements, check the available parts in the Other Mercedes category.

When selecting electronic components and powertrain elements, comparative analyses of solutions used in higher-class cars can also be helpful. In this context, it is worth reading the material describing construction differences in Audi sports models, available in the article Audi RS vs other models – what is hidden under the hood and chassis?, which discusses, among other things, the manufacturers' approach to selecting original parts and components with increased durability.