Mercedes-Benz A-Class W168 SLK R170 Left N/S Wing Mirror Blinker Lamp Light

Mercedes-Benz A-Class W168 SLK R170 Left N/S Wing Mirror Blinker Lamp Light is an original turn signal lighting component mounted in the left side mirror, designed for Mercedes vehicles. It allows for the restoration of proper turn signaling and improves the visibility of light signals for other road users, which translates into safer vehicle operation. Thanks to its factory design, it is a convenient solution for installation and fits perfectly with the mirror's geometry.

Specifications and technical data

• SKU: A1708201721
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A1708201721
• Substitutable numbers: A1708201721, A 170 820 17 21, BG
• Location on the vehicle: Left
• Color: Black
• Offset (ET):
• Category: Other Exterior Parts & Accessories

Purpose and function of the mirror turn signal

The presented turn signal is an integrated component of the left side mirror, responsible for clearly signaling the intention to change direction or lanes. Its placement in the mirror housing improves signal visibility from the front, side, and partially from the rear of the vehicle, which increases the clarity of the driver's maneuvers in urban traffic and on highways.

This element is particularly important in situations where standard turn signals in the bumper or fender may be partially obscured, e.g., by other vehicles. A functional mirror turn signal therefore supports safe light communication with the surroundings, which is significant both during daily driving and in conditions of limited visibility.

Construction, color, and fitment

The turn signal construction has been prepared for precise installation in the left mirror of the corresponding Mercedes compact class model. The black housing allows for aesthetic integration into the stock mirror without the need for additional visual modifications. As a result, the vehicle's stylistic consistency is maintained after replacement.

The element is designed as a part dedicated to a specific location on the vehicle, which facilitates installation and minimizes the risk of improper fitment. In practice, this means that once properly seated in the mirror housing, the parting lines and edges remain even, and the turn signal itself does not protrude from the mirror surface.

Condition, application, and benefits of replacement

The offered turn signal is a used item, which, in the case of original Mercedes components, often allows for combining good build quality with a more favorable purchase cost compared to new parts. For the user, this means the ability to restore full functionality of the turn signal lighting while maintaining the factory character of the vehicle.

Replacing a damaged or faulty mirror turn signal with a working unit brings a number of practical benefits:

• restoration of proper turn signaling on the driver's side,
• increased vehicle visibility for other road users,
• reduction of the risk of faults related to the lighting installation,
• maintenance of the consistent external appearance of the mirror.

Matching by numbers and support with selection

Selecting the correct mirror turn signal for a Mercedes should always be based on the part number and compatibility with the specific body version. This avoids installation problems and ensures proper cooperation with the vehicle's electrical system. In case of doubt, it is useful to compare the markings on the existing element with catalog data or service documentation.

If you want to deepen your knowledge on verifying components by manufacturer numbers, practical methods of checking compatibility, and the specifics of parts for premium brands, the following guide on online shopping will be helpful: verifying parts by OEM numbers and paint codes.

Related categories and technical materials

If you are planning a comprehensive repair or upgrade of the body area in your Mercedes and need other elements from the same group, such as mirror housings, glass inserts, or additional lighting modules, check the available parts in the Other Mercedes category.

For those interested in comparing technical solutions used in sports versions of premium segment cars, including engine designs, braking systems, and chassis, an interesting supplement to your knowledge will be the article: Audi RS vs other models – what is hidden under the hood and chassis?.