Hi, I have had my car on the diagnostics after the EML came on. Its the reductant injection valve that stuck shut. I can not find anywhere that sells this part. Just wondered if anybody would know of specialist. Ive tried Kia main dealer and no joy. Thanks
A diesel reductant valve, more commonly known as a DEF injector, is a component in the Selective Catalytic Reduction (SCR) system of modern diesel engines that injects a liquid reductant, or Diesel Exhaust Fluid (DEF), into the exhaust stream. This injection is precisely timed and metered by the engine's control module to convert harmful nitrogen oxides (
NOxcap N cap O sub x
) into harmless nitrogen (
N2cap N sub 2
) and water vapor (
H2Ocap H sub 2 cap O
) before they are released into the atmosphere.
How it works
Emissions reduction:
Diesel engines produce
NOxcap N cap O sub x
emissions from the combustion of fuel.
DEF injection:
The reductant valve or injector precisely sprays a metered amount of DEF (such as AdBlue) into the hot exhaust.
Conversion process:
The heat of the exhaust gas decomposes the DEF into ammonia, which then reacts with the
NOxcap N cap O sub x
in the SCR catalyst.
Harmful to harmless:
This reaction converts the harmful
NOxcap N cap O sub x
into nonpolluting nitrogen and water vapor.
Importance
Meets emissions standards:
The SCR system with the reductant valve is crucial for modern diesel engines to meet strict emissions regulations.
Maintains performance:
Proper operation of the reductant valve is essential for the efficiency of the entire SCR system and can help prevent the engine from entering a "limp mode" or triggering diagnostic trouble codes (DTCs).
Contributes to a cleaner environment:
By converting
NOxcap N cap O sub x
into less harmful gases, it significantly reduces pollution