Understanding Diesel Exhaust Fluid: What to Do If the Light Goes …
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WEBSep 18, 2020 · Diesel exhaust fluid is a common component in the effort to clean up modern diesel tailpipe emissions. Known as DEF, or by various trade names such as AdBlue, the fluid is periodically injected into the exhaust where it works with a catalyst to reduce nitrogen oxide (NOx) emissions.
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