Range Rover Evoque L551 AdBlue Cap Ad Blue Tank Filler Cover K8D2-5J239-A

Range Rover Evoque L551 AdBlue Cap Ad Blue Tank Filler Cover is a precisely fitted component from the Fuel filler flaps and caps group, designed for the AdBlue dosing system in the L551 generation Evoque model. The blue finish facilitates quick identification of the cap during vehicle maintenance and highlights its purpose for the exhaust emission reduction system.

Specifications and technical data

• SKU: K8D2-5J239-A
• Mark: Range Rover
• Condition: Used
• OEM Part Number: K8D2-5J239-A
• Substitutable numbers: K8D2-5J239-A, K8D25J239A, K8D25J239AD, K8D2-5J239-AD, 109123490
• Part type: Fuel Tank Cap
• Color: Blue
• Rim width: 5
• Category: Fuel Tank Caps

Purpose and technical function

The AdBlue tank cap in the Range Rover Evoque L551 is responsible for tightly sealing the urea solution filler, which reduces the risk of contaminants entering the system and minimizes the evaporation of the operating medium. A correctly selected element from this group ensures stable operating conditions for the SCR exhaust treatment system, thereby helping to maintain the vehicle's compliance with emission standards.

The product belongs to the Fuel filler flaps and caps category, but in this case, it is dedicated to the AdBlue circuit; therefore, its construction and materials used are adapted for contact with urea solution and the typical operational loads in modern diesel units.

Construction, color scheme, and ergonomics

The blue finish of the cap serves both a visual and practical function – it allows for clear differentiation between the AdBlue filler and the standard fuel filler, which reduces the risk of error during refueling. The color is consistent with the industry-standard marking for AdBlue systems, facilitating work for service centers and fleet users.

The cap's design is engineered for a secure grip and convenient operation, even when wearing work gloves. The solutions used are aimed at stable pressure against the filler neck and repeatable sealing after each tightening, which is important for frequent refueling in both urban and extra-urban operating conditions.

Performance parameters and fitment

The element has been developed for compatibility with the AdBlue system in the Range Rover Evoque L551, which translates into proper fitment with the filler neck and compatibility with the factory body geometry. The cap is part of the auxiliary system, but its proper operation affects:

• maintaining the proper seal of the AdBlue filler,
• protection against dirt and moisture entering the tank,
• long-term stability of the exhaust emission reduction system.

By using a dedicated solution, the user avoids problems typical of universal-design replacements, such as loose fitment or accelerated seal wear.

Characteristics of the used product

The offered cap is a used item, which in practice means it comes from dismantling and was previously used in a vehicle. Such components are popular as an economical alternative to new parts, especially when maintaining the original vehicle specification and fitment to the factory system is a priority.

In the case of filler caps, it is essential that the sealing function and correct mounting geometry are preserved. Choosing an original element from the secondary market allows for reduced service costs while maintaining compliance with the vehicle manufacturer's solutions.

Integration with other system components

The AdBlue tank cap works in conjunction with the filler neck, the lines leading to the tank, and the urea solution tank itself. Proper operation of the entire system requires that each of these components is matched in terms of construction and materials. In the case of the Range Rover Evoque L551, using a dedicated cap reduces the risk of leaks and problems with filler access during refueling.

If you are planning a comprehensive repair or upgrade of the fluid filler area in your Range Rover and need other elements from the same group, such as additional caps, flaps, or filler covers, check the available parts in the Range Rover fuel filler flaps and caps category.

Technical support and selection by numbers

The selection of an AdBlue filler cap should always be based on the vehicle manufacturer's catalog data and part numbers, which minimizes the risk of ordering errors. In the case of fuel systems and related components, such as fillers, tanks, or venting elements, diagnostic procedures and verification by OEM and reference numbers are helpful.

To better understand the relationships between the tank, filler, and other components, it is worth reading the guide Fuel system – injectors, pumps, and fuel tank: maintenance and regeneration, which discusses the principles of selecting parts by numbers and the basics of operating supply systems.