Mercedes W166 Diesel Engine AdBlue Additive Tank Fluid Reservoir A1664703901

Visual condition of the part

The product shows signs of use visible in the photos.

Mercedes W166 Diesel Engine AdBlue Additive Tank Fluid Reservoir is an original exhaust emission reduction system component designed for use with diesel units. Thanks to its factory-spec design, it ensures proper storage and delivery of the AdBlue solution, which supports the efficient operation of the SCR system and helps maintain emission standards. This solution is dedicated to users who expect compatibility with the factory installation and stable operation of the exhaust gas treatment system.

Specifications and technical data

• SKU: A1664707201-1
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A1664707201
• Substitutable numbers: A1664707201, A 166 470 72 01, A1664703901, A 166 470 39 01
• Fuel type: Diesel
• Part type: Fuel Tank
• Category: Fuel Tanks & Filler Necks

Purpose and function in the AdBlue system

The presented AdBlue fluid reservoir plays a key role in the nitrogen oxide reduction system in Mercedes W166 class vehicles with a diesel engine. It is responsible for the safe storage of the urea solution and its stable delivery to other system components, which enables the correct dosing of the agent into the exhaust stream. A properly functioning reservoir reduces the risk of SCR system errors, warning messages on the dashboard, and power loss resulting from emergency mode.

Construction and integration with the fuel and emission system

The component has been designed as part of the system accompanying the fuel installation in diesel-powered vehicles. The reservoir construction is adapted to the specifics of AdBlue fluid, including its chemical properties and the operating temperature range in the chassis compartment. A properly shaped housing facilitates installation at the mounting points provided by the manufacturer, and the integrated connection ports allow for a tight connection with the lines delivering the fluid to other system components.

Due to its factory origin, the reservoir works with original sensors and AdBlue system equipment, which promotes the maintenance of correct fluid level readings and stable communication with the vehicle's electronics. This solution minimizes the risk of leaks, improper venting, or disruptions in the flow of the solution.

Benefits of using an original AdBlue reservoir

Using an original reservoir in a Mercedes W166 diesel vehicle brings a number of practical operational benefits:

• maintaining compliance with the factory exhaust emission reduction system,
• stable operating conditions for the AdBlue fluid at various ambient temperatures,
• reduction of the risk of leaks and air entering the system,
• proper cooperation with fluid level and temperature sensors,
• reduction of the probability of SCR system errors.

For the user, this means more predictable operation of the exhaust gas treatment system, no need for frequent service interventions, and maintenance of emission parameters at the level intended by the manufacturer. Combined with a properly functioning fuel and injection system, this allows for stable, economical operation of the diesel unit.

Component condition and use in service practice

The offered reservoir comes from the Fuel tanks and filler pipes group and is intended for re-installation in a vehicle after verifying compatibility with the specific car configuration. In service practice, it is used in cases of mechanical damage to the existing reservoir, leakage problems, or situations where the existing component has degraded due to long-term operation. Replacing the reservoir is recommended especially when difficult-to-remove internal contamination or recurring errors related to the AdBlue fluid circulation appear.

The selection of parts should be based on vehicle identification data and reference numbers, which helps avoid installation problems and ensures full compatibility with the existing installation. This approach shortens repair time and reduces the risk of needing further intervention in the system.

Technical support and related components

When working on the fuel supply and operating fluid storage system, it is worth ensuring comprehensive diagnostics. A detailed discussion of the principles of the fuel system, selecting components by identification numbers, and regeneration procedures can be found in the article: Fuel system – injectors, pumps, and fuel tank: maintenance and regeneration. This material helps to better plan service work and select appropriate accompanying components.

If you are planning a comprehensive repair or upgrade of the fuel supply and operating fluid storage area in your Mercedes and need other elements from the same group, such as additional reservoirs, supply lines, or filler components, check the available parts in the Mercedes fuel tanks and filler pipes category.