Mercedes W166 Diesel Fuel Filler Flap Cap Cover Obsidian Black Metallic 197

Visual condition of the part

The product shows signs of use visible in the photos.

Mercedes W166 Diesel Fuel Filler Flap Cap Cover Obsidian Black Metallic 197 is an original body component from the Fuel filler flaps and accessories group, designed for installation in the rear part of the vehicle. Thanks to its factory fit for the W166 series and compatibility with the diesel engine fuel system, it ensures a consistent appearance and proper operation of the refueling zone. The carefully selected Obsidian Black Metallic color allows for maintaining a uniform body paint line.

Specifications and technical data

• SKU: A1667570006-OB
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A1667570006
• Substitutable numbers: A1667570006, A 166 757 00 06
• Location on the vehicle: Rear
• Fuel type: Diesel
• Color: Obsidian Black Metallic - 197
• Category: Fuel Flaps & Components

Purpose and function of the fuel filler flap

The presented flap is dedicated to the W166 series body with a diesel engine. The component operates in the rear part of the vehicle, protecting the fuel filler from dirt, moisture, and mechanical damage. A properly selected fuel filler cover is important both for the safety of the fuel system operation and for maintaining the aesthetics of the bodywork.

The original design ensures proper fitment with the body, correct hinge geometry, and adequate rigidity, which reduces the risk of play, rattles, and leaks in the filler area. This is particularly important in vehicles with a diesel engine, where the fuel system operates under specific operational loads.

Color and paint matching

A key parameter of this flap is the Obsidian Black Metallic color, marked with the paint code used factory-wide in vehicles of this brand. The metallic black provides visual consistency with the other body panels, which is significant for post-accident repairs or spot replacement of body parts.

Thanks to the shade's compatibility with the factory paint palette, it is possible to limit the scope of additional painting work or eliminate it entirely, provided the coating condition is acceptable relative to the rest of the body. This solution allows for shortening repair time and optimizing costs while maintaining high visual quality.

Characteristics of the used component

As a used part, the flap comes from vehicle dismantling and has been verified for installation suitability. This type of component is a good choice in situations where the priority is to maintain original geometry and compatibility with factory mounts, while keeping a reasonable repair budget.

In the case of body components, it is essential that the flap's support structure, mounting points, and the working surface interacting with the hinge and opening mechanism retain full functionality. A used, original component usually fits better into the existing body structure than replacements with universal geometry.

Significance for the fuel system and diesel operation

In vehicles with a diesel engine, a properly functioning fuel filler cover limits the ingress of water, dirt, and road salt around the cap, which promotes a longer service life for fuel system components. A tight and stable flap reduces the risk of corrosion in the filler zone and facilitates daily handling during refueling.

For drivers who want to better understand the impact of the refueling zone's condition on the entire fuel system, an article describing the diagnostics and operation of fuel components will be useful – detailed information can be found in the material Fuel system – injectors, pumps, and fuel tank: maintenance and regeneration.

Integration with other Mercedes fuel filler covers

If you are planning a comprehensive repair or upgrade of the fuel filler zone in your Mercedes and need other elements from the same group, such as additional covers, shields, or mounting accessories, check the available parts in the category Mercedes fuel filler covers and accessories.

Summary of application

Mercedes W166 Diesel Fuel Filler Flap Cap Cover Obsidian Black Metallic 197 is a functional, original body component designed for the rear part of the vehicle, working with the diesel engine fuel system. The use of the factory metallic black color allows for maintaining visual consistency of the body, and the design compliant with the manufacturer's project facilitates installation and ensures proper operation of the refueling zone in daily use.