Mercedes Sprinter AdBlue / DEF Injector – Genuine OEM | NCV3 & VS30 All BlueTec Engines | #0004905100 (2010–2025)

A failed AdBlue injector on a BlueTec Sprinter stops DEF delivery into the exhaust stream at the SCR catalyst — causing the NOx reduction system to fail, triggering fault codes, and initiating the engine power-restriction countdown that escalates with each subsequent cold start until the injector is replaced. This is the Genuine Mercedes-Benz OEM AdBlue injector for NCV3 and VS30 Sprinters equipped with BlueTec SCR emissions systems, a direct replacement that restores precise DEF dosing and full SCR system operation.

What This Part Does

The AdBlue injector — also called the DEF doser or SCR injector — is a solenoid-controlled precision nozzle mounted in the exhaust pipe upstream of the SCR catalyst. On command from the SCR control module, it atomizes a precisely metered quantity of diesel exhaust fluid into the hot exhaust stream where the urea solution thermally decomposes into ammonia. This ammonia then reacts with nitrogen oxides in the SCR catalyst, converting them to harmless nitrogen and water. The dosing quantity is calculated in real time by the ECU based on exhaust temperature, NOx sensor feedback, and engine load — the injector must respond precisely to these commands to maintain SCR efficiency. When the injector's solenoid sticks, its nozzle tip crystalizes from AdBlue deposit buildup, or its internal seals degrade, dosing becomes inaccurate or stops entirely — causing the SCR system to log efficiency faults and restrict engine operation.

Common Symptoms of a Failing AdBlue Injector

• Check engine light with fault codes related to SCR dosing, injector circuit, or NOx efficiency
• Engine entering limp mode or power restriction from emissions system fault
• AdBlue consumption that drops to near zero despite a full tank — a sign the injector has stopped flowing
• SCR efficiency fault codes that return after refilling the DEF tank and clearing codes
• AdBlue warning countdown in the instrument cluster that escalates despite recent top-off

When to Replace

Replace when the injector is confirmed faulty by XENTRY or a compatible scan tool with active injector circuit or dosing fault codes, and the DEF pump, tank level, and supply lines have been ruled out as the source. After replacement, flush the DEF supply line to the injector to remove any crystallized AdBlue residue, and recalibrate the SCR system with XENTRY to restore normal dosing operation.

BlueTec Specific — VIN Verification Required

This AdBlue injector fits NCV3 and VS30 Sprinters equipped with BlueTec SCR emissions systems across multiple engine families. Always verify your engine code, emissions configuration, and VIN before ordering. Contact us and we'll confirm fitment before you buy.

Fitment

• 2010–2018 Mercedes-Benz Sprinter 2500 / 3500 – All BlueTec engines (NCV3/W906)
• 2010–2018 Freightliner Sprinter 2500 / 3500 – All BlueTec engines (NCV3)
• 2019–2025 Mercedes-Benz Sprinter 1500 / 2500 / 3500 / 3500XD – All diesel engines (VS30/W907)

✔ Always flush DEF supply lines and recalibrate SCR system after replacement
✔ Always verify VIN and engine code before ordering

Part Numbers

• Mercedes OEM: 0004905100 / A0004905100 / 000-490-51-00
• Manufacturer: Genuine Mercedes-Benz
• SKU: 0004905100