Diesel Emissions Fluid (DEF) Injector Module for Audi Q7 A8 Q5 A6 A7 0444021021

Diesel Emissions Fluid (DEF) Injector Module for Audi

This diesel emissions fluid (DEF) injector module regulates the spray of urea solution into the exhaust system, matching OEM cross-reference 0444021021.

Overview

This diesel emissions fluid (DEF) injector module delivers precise amounts of fluid into the exhaust stream to reduce tailpipe emissions. Designed to restore proper selective catalytic reduction (SCR) system operation, this diesel emissions fluid (DEF) injector module resolves warning lights caused by improper dosing. Mechanics and vehicle owners can rely on this diesel emissions fluid (DEF) injector module to maintain environmental compliance.

Built For Performance

• Corrosion-resistant internal valves for handling urea solution
• Precision nozzle design for optimal fluid atomization
• Robust thermal housing to endure high exhaust heat
• Exact electrical connector pins for plug-and-play wiring

Fits These Machines

• for Audi Q7
• for Audi A8
• for Audi Q5
• for Audi A6
• for Audi A7

On-The-Job Use

• Replacing a clogged urea injector to clear SCR system error codes
• Restoring normal exhaust treatment during routine diesel emissions maintenance
• Passing vehicle emissions testing by ensuring correct DEF dosing

Specs At A Glance

Good To Know

Q: What causes a DEF injector to fail? A: Over time, crystallized urea deposits can clog the injection nozzle, or electrical solenoids can wear out. Regular maintenance and using clean fluid help prevent these blockages.

Q: Will replacing this module turn off the check engine light? A: Yes, once the system detects correct fluid dosing pressure, the related emission warning lights should clear. Some vehicles may require a manual code reset after installation.

Slight variation in finish or dimensions may occur between production runs, and fit can depend on serial number, so confirm compatibility before ordering.