Bosch Diesel Exhaust Fluid (DEF) Injection Nozzle 0444021031
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Bosch Diesel Exhaust Fluid (DEF) Injection Nozzle 0444021031
Bosch Diesel Exhaust Fluid (DEF) Injection Nozzle 0444021031 - view 2
Bosch Diesel Exhaust Fluid (DEF) Injection Nozzle 0444021031 - view 3
Bosch Diesel Exhaust Fluid (DEF) Injection Nozzle 0444021031 - view 4

Bosch Diesel Exhaust Fluid (DEF) Injection Nozzle P/N:0444021031

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$311.99
MPN: 0444021031
Item Package Quantity: 1
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Bosch Diesel Exhaust Fluid (DEF) Injection Nozzle P/N:0444021031
Bosch Diesel Exhaust Fluid (DEF) Injection Nozzle P/N:0444021031
$311.99

Keep your diesel's SCR emissions system dosing correctly with the Bosch Diesel Exhaust Fluid (DEF) Injection Nozzle / Metering Module 0444021031. This unit meters and sprays diesel exhaust fluid into the exhaust stream ahead of the SCR catalyst, where the DEF helps convert NOx into nitrogen and water. It is a direct-fit replacement for the 2014-2015 Freightliner Sprinter 2500, 2014-2015 Freightliner Sprinter 3500, 2014-2015 Mercedes-Benz Sprinter 2500, and 2014-2015 Mercedes-Benz Sprinter 3500 — see the Buyer's Guide tab to confirm your vehicle.

  • Robust OE design: Built with Bosch OE quality for reliable operation in demanding conditions.
  • Emissions dosing: Adheres to strict DEF dosing limits, helping the aftertreatment system meet emission targets.
  • Extended service life: Designed for an operational life of up to 35,000 hours to reduce how often it needs replacing.
  • Precise DEF delivery: Spray pattern, droplet size, and feed rate are tuned for even DEF distribution and effective ammonia conversion for SCR efficiency.

Bosch is a leading OE supplier of diesel fuel and emissions systems. If a failed DEF metering module is behind your DEF-system fault code or SCR warning, this replaces it — diagnose the cause before ordering.

Frequently Asked Questions

What does this Bosch part do?

It meters and sprays diesel exhaust fluid (DEF) into the exhaust upstream of the SCR catalyst, where the DEF helps convert NOx into nitrogen and water.

Is it also called a metering module?

Yes. This part is listed as a Diesel Exhaust Fluid (DEF) Injection Nozzle and is also known as a Bosch metering (dosing) module — the same component under both names.

Which vehicles does 0444021031 fit?

It's a direct-fit replacement for the 2014-2015 Freightliner Sprinter 2500 and 3500 and the 2014-2015 Mercedes-Benz Sprinter 2500 and 3500. Check the Buyer's Guide tab to confirm.

How long is it designed to last?

Bosch designed this module for an operational life of up to 35,000 hours, which reduces how often it needs to be replaced.

What are signs the DEF metering module may need replacing?

DEF-system fault codes, SCR/DEF warning lights, or dosing faults may point to a failed module. Diagnose the cause first, as these symptoms can have other sources.

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