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Diesel Exhaust Fluid (DEF) is a non-toxic liquid used in modern diesel vehicles to help reduce harmful emissions. It's part of a system called Selective Catalytic Reduction (SCR).
DEF goes in a separate tank, not the fuel tank.
A warning light shows when DEF is low.
Reduces air pollution from diesel engines.
Helps vehicles meet emission standards (like Euro 6 or EPA regulations).
Required in most modern diesel trucks, buses, and some cars.
How It Works:
DEF is injected into the exhaust system, not the engine.
It reacts with nitrogen oxides (NOx) in the exhaust.
The reaction converts harmful NOx gases into nitrogen and water vapor, which are harmless.
Traffic rules
