Audi A4 B9 Front Windscreen Rain Sensor 81A955555A

Audi A4 B9 Front Windscreen Rain Sensor is a precision component from the Cameras, monitoring and sensor kits group, responsible for the automatic response of the wiper system to precipitation. Mounted in the front area of the vehicle, it ensures convenient, semi-automatic wiper operation, improving driving comfort and safety in changing weather conditions. A used original part is a sensible choice for drivers who expect factory compatibility and stable system performance.

Specifications and technical data

• SKU: 81A955555A
• Mark: Audi
• Condition: Used
• OEM Part Number: 81A955555A
• Substitutable numbers: 81A955555A, 81A 955 555 A
• Location on the vehicle: Front
• Category: Camera, Monitor & Sensor Kits

Purpose and function of the rain sensor

The presented sensor is dedicated to the front part of the vehicle, where it works with the windshield and the wiper system. Its task is to analyze the amount of water on the glass surface and transmit a signal to control the wiper operation. Thanks to this, the driver gains:

• automatic adjustment of wiper frequency to the intensity of precipitation,
• better visibility without the need to constantly reach for the lever,
• stable system operation in city traffic and on the road.

Benefits of using an original Audi component

The original rain sensor designed for Audi ensures the preservation of the system's factory operating parameters. This means:

• proper cooperation with on-board electronics and comfort modules,
• appropriate calibration of the response to different levels of precipitation,
• consistency with factory settings for wiper operating modes.

Thanks to this, the automatic wiper system works predictably and in accordance with the manufacturer's assumptions, which is important for both comfort and safety of vehicle use.

Vehicle placement and installation aspects

The sensor is designed for installation in the front part of the vehicle, in the windshield area. In practice, this means integration with the existing wiper system and equipment located in the upper part of the windshield. When selecting and installing, it is worth paying attention to:

• compatibility of the element with the specific version of the Audi A4 B9 equipment,
• proper seating in the holder by the windshield,
• cleanliness of the working surface of the windshield at the sensor's location.

A properly selected and installed sensor allows for maintaining the full functionality of the system without the need for additional installation modifications.

Characteristics of the used product

The offered rain sensor is a used component, which allows for reducing repair costs while maintaining the original manufacturer's specification. This type of solution is particularly attractive for vehicles used on a daily basis, where a reasonable balance between price and functionality counts. A used component from the Cameras, monitoring and sensor kits group can be an effective alternative to new replacements with uncertain parameters.

Expanding the sensor system in Audi

If you are planning a comprehensive repair or upgrade of the front area in your Audi and need other elements from the same group, such as additional sensors, monitoring modules, or elements supporting the operation of assistance systems, check the available parts in the Audi cameras, monitoring and sensor kits category.

When choosing a used rain sensor or other electronic components, it is worth avoiding random purchases and following proven principles of part selection. If you want to better prepare for your purchase and learn about common pitfalls related to tuning and installing used parts, check out the guide Buying used car parts • Most common mistakes when choosing tuning parts.