465-017 | Genuine DuraWRX® DEF Multifunction Head 40 micron, 18" Bypass Valve Better combustion efficiency means less

Better combustion efficiency means less unburned fuel and lower CO₂ output

It monitors wheel speed and controls brake pressure to prevent the wheels from locking up during braking

improving vehicle balance and handling while saving space

Even if the horn switch is fine

or whining sounds

465-017 | Genuine DuraWRX® DEF Multifunction Head 40 micron, 18" Bypass Valve Better combustion efficiency means lessDescription: A Diesel Exhaust Fluid (DEF) header 465 017 is a key component in a diesel vehicles emissions control system, specifically within the Selective Catalytic Reduction (SCR) system. The DEF header (also called a DEF tank head or DEF sender assembly) is the unit mounted on or inside the DEF tank. It monitors and manages the Diesel Exhaust Fluid thats injected into the exhaust to reduce harmful nitrogen oxide (NOx) emissions. Part Number: 465