Mercedes Sprinter AdBlue Tank Filler Cap – Genuine OEM | NCV3 & VS30 | #9064701705 (2010–2024)

A missing, cracked, or improperly sealing AdBlue tank cap on a Mercedes Sprinter exposes the DEF fluid to contamination — allowing moisture, debris, and diesel vapors to compromise the urea concentration that the SCR system depends on for accurate NOx reduction. This is the Genuine Mercedes-Benz OEM AdBlue tank filler cap for NCV3 and VS30 Sprinters equipped with the SCR emissions system, a direct replacement that restores a proper sealed closure on the DEF reservoir.

What This Part Does

The AdBlue tank filler cap seals the DEF reservoir fill neck located in the engine compartment, keeping the urea solution inside at its correct 32.5% concentration and preventing external contamination from entering the tank. AdBlue is a precision chemical solution — even small amounts of contamination from water, diesel fuel, or particulates can degrade its concentration, causing the SCR system to log faults and reduce dosing efficiency. The cap also maintains a slight pressure differential in the tank that prevents premature evaporation of the urea solution during storage and operation. A cap that is lost, cracked, or fails to seat and seal properly is a common and easily overlooked source of SCR system contamination issues that can generate fault codes without any other obvious symptoms.

Common Symptoms of a Missing or Failing AdBlue Cap

• AdBlue quality fault codes or DEF concentration warnings in the instrument cluster
• Unexplained AdBlue consumption or reduction in DEF tank level without equivalent dosing
• SCR efficiency fault codes that return after refilling the tank with fresh AdBlue
• Visible contamination or discoloration of the AdBlue fluid at the filler neck
• Cap found cracked, stripped, or missing during routine inspection or AdBlue top-off

When to Replace

Replace immediately when the cap is found missing, cracked, or no longer seating securely. Also replace as a precaution any time an SCR contamination fault is diagnosed — a compromised cap is one of the most common entry points for contamination that degrades AdBlue quality and triggers DEF system faults.

Fitment

• 2010–2018 Mercedes-Benz Sprinter 2500 – With SCR/AdBlue system (NCV3/W906)
• 2010–2018 Mercedes-Benz Sprinter 3500 – With SCR/AdBlue system (NCV3/W906)
• 2019–2024 Mercedes-Benz Sprinter 1500 – With SCR/AdBlue system (VS30/W907)
• 2019–2024 Mercedes-Benz Sprinter 2500 – With SCR/AdBlue system (VS30/W907)
• 2019–2024 Mercedes-Benz Sprinter 3500 – With SCR/AdBlue system (VS30/W907)
• 2019–2024 Mercedes-Benz Sprinter 3500XD – With SCR/AdBlue system (VS30/W907)

✔ SCR-equipped models only — not all NCV3 Sprinters were equipped with AdBlue systems
✔ This part is VIN specific — always verify before ordering

Part Numbers

• Mercedes OEM: 9064701705 / A9064701705 / 906-470-17-05
• Manufacturer: Genuine Mercedes-Benz
• SKU: 9064701705OE