Bosch 0444021021 Diesel Exhaust Fluid DEF Metering Module

The Bosch 0444021021 Diesel Exhaust Fluid (DEF) Metering Module, also called a DEF dosing module, urea injector or DEF injector, is part of a diesel emissions control system. It injects diesel exhaust fluid into the exhaust stream to help reduce harmful emissions.

Key Points:

• Bosch metering (dosing) module, part number 0444021021
• Meters diesel exhaust fluid into the exhaust system as part of the emissions system
• Sold as a single Bosch replacement part

A replacement metering module helps a diesel emissions system keep dosing exhaust fluid as designed.