Diesel engines produce nitrogen oxide gases during combustion, which must be treated before leaving the exhaust system. The Cummins B6.7, L9 SCR 2022–2024: OEM 5418679 is a Selective Catalytic Reduction (SCR) assembly designed to help convert these gases into safer compounds. Inside the aftertreatment system, the SCR catalyst works with diesel exhaust fluid to break down nitrogen oxides into nitrogen and water vapor, helping reduce harmful emissions from the engine.
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Designed for Cummins B6.7 and L9 engines from 2022 to 2024, the OEM 5418679 SCR integrates into the factory aftertreatment system layout.
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The catalyst chamber allows diesel exhaust fluid to mix with exhaust gases so chemical reactions can occur inside the SCR unit.
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When exhaust flows through the catalyst, nitrogen oxide pollutants are converted into nitrogen and water vapor.
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The internal catalyst structure provides a large reaction surface that supports consistent exhaust gas treatment.
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A properly functioning OEM 5418679 SCR assembly helps maintain balanced readings from emission monitoring sensors within the exhaust system.
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Correct SCR operation works together with the DEF dosing system to control nitrogen oxide levels.
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The catalyst housing is designed to handle high exhaust temperatures and continuous heavy-duty operation.
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Replacing a worn or restricted SCR unit helps restore proper exhaust gas processing in the aftertreatment system.
The Cummins B6.7, L9 SCR 2022–2024: OEM 5418679 from Tamerx Diesel Parts provides a dependable replacement solution for maintaining proper exhaust treatment. With the correct SCR assembly installed, the aftertreatment system can continue reducing emissions while supporting reliable engine operation.
















































