Audi A8 D4 Fuel Filler Flap Tank Cap Cover Foil 4H0809909B Monsoon Grey X7R

Audi A8 D4 Fuel Filler Flap Tank Cap Cover Foil Monsoon Grey X7R is an original body component designed for the rear section of the Audi luxury sedan. It provides a consistent paint finish in the Monsoon Grey Metallic shade, maintaining the factory body lines and the proper operation of the fuel filler locking mechanism. It is a practical solution for post-accident repairs, bodywork and paint corrections, or replacing a damaged flap.

Specifications and technical data

• SKU: 4H0809909B-MOG
• Mark: Audi
• Condition: Used
• OEM Part Number: 4H0809909B
• Substitutable numbers: 4H0809909B, 4H0 809 909 B
• Location on the vehicle: Rear
• Color: Monsoon Grey Metallic - X7R
• Category: Fuel Flaps & Components

Purpose and function of the fuel filler flap

The Audi A8 D4 Fuel Filler Flap Tank Cap Cover Foil is responsible for shielding the fuel cap and filler neck from contaminants, moisture, and mechanical damage. A correctly selected component ensures:

• maintenance of the body line continuity in the rear part of the vehicle,
• proper closing and opening of the fuel filler,
• protection of the fuel system from dirt and water,
• aesthetic matching to the factory paint.

Its placement in the rear zone of the vehicle requires precise fitting with the fender and hinge mechanism, which is why using an original flap is important for both appearance and daily functionality.

Monsoon Grey Metallic X7R color – paint matching

The presented flap is finished in Monsoon Grey Metallic – X7R, a color characteristic of many Audi A8 D4 units. Thanks to this, when properly matched to a specific car, the process of repainting can be reduced or completely omitted, which shortens repair time and reduces costs.

The metallic paint coating provides:

• a visually consistent look for the entire side and rear part of the body,
• appropriate color depth and light reflections typical of premium paints,
• easier matching to other body elements in the same shade.

Original Audi part and benefits of choosing a used component

The flap comes from the original Audi parts line, which means maintaining factory dimensions, geometry, and compatibility with the stock mounting and opening mechanism. In practice, this translates to:

• a secure fit to the Audi A8 D4 body without modifications,
• compliance with the factory fuel filler locking system,
• maintaining the original appearance of the vehicle after repair.

As a used item, the flap represents a reasonable compromise between cost and quality – it allows for restoring full functionality and aesthetics of the fuel filler without investing in more expensive new components. If you are considering whether it is better to choose a used part or a replacement, the article on the reasons why a used OEM part is often a better choice than a replacement may be helpful.

Application in the fuel system and service aspects

The fuel filler flap, although a body element, works directly with the fuel system, securing the filler area against external factors. A tight seal limits the risk of water and dirt entering the area around the cap, which is important for the long-term, trouble-free operation of the vehicle.

When replacing the flap, it is worth paying attention to the condition of the cap, the filler neck, and surrounding fuel system components. For drivers who want to approach the topic comprehensively, we recommend the guide explaining the construction and maintenance of the fuel system, injectors, pumps, and fuel tank.

Summary – when to use this Audi A8 D4 flap

Audi A8 D4 Fuel Filler Flap Tank Cap Cover Foil Monsoon Grey X7R is a good solution for post-collision repairs, replacing a damaged or scratched flap, and for renovating the rear part of the body. Its original origin, proper placement on the vehicle, and factory metallic paint in the Monsoon Grey shade facilitate the quick restoration of the aesthetics and functionality of the fuel filler without unnecessary modifications.

If you are planning a wider range of work around the fuel filler or are looking for similar items, check out related products in the Fuel filler covers and accessories category to select parts that are technically and visually consistent.