Volvo D13 DEF Dosing Unit Bosch | 22391563 21575532

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The Bosch DEF Dosing Unit (22391563 / 21575532) for Volvo D13 engines is a genuine OEM diesel exhaust fluid injector. This unit precisely meters DEF into the exhaust stream to activate the SCR (Selective Catalytic Reduction) system, reducing harmful NOx emissions to EPA-compliant levels. A failing DEF dosing unit triggers SCR fault codes, forces the engine into derate mode, and can result in failed emissions inspections. Bosch is the original supplier of DEF dosing components to Volvo.

Q: Which trucks does this DEF dosing unit fit?
A: Fits Volvo VNL trucks with D13 engines. Genuine Bosch part numbers 22391563 and 21575532.

Q: What fault codes indicate a failing DEF dosing unit?
A: Common codes include SPN 4334, SPN 5246, and SCR system fault codes related to DEF dosing pressure or flow.

Q: What is included with this dosing unit?
A: Includes the complete Bosch DEF dosing valve assembly ready for installation.

Q: Is this a genuine Bosch part?
A: Yes. This is a genuine Bosch OEM unit — the same component originally installed by Volvo on D13-powered trucks.

Q: Will a faulty dosing unit cause engine derate?
A: Yes. A non-functional DEF dosing unit will cause the SCR system to fail, triggering progressive engine derate after a set number of hours.