A properly functioning exhaust aftertreatment system is essential for diesel engines to meet emissions standards and maintain dependable operation. The Selective Catalytic Reduction (SCR) assembly is a key component in that system, responsible for reducing harmful nitrogen oxide gases before they leave the exhaust. For Cummins X15 engines built from 2018 through 2024, the Cummins X15 SCR 2018–2024: OEM 4394838 offers a reliable, factory-matched replacement designed to support efficient emissions control and lasting performance.
• The SCR assembly targets nitrogen oxide (NOx) emissions, converting them into harmless nitrogen and water,
helping your truck stay compliant with EPA emissions regulations and operate with cleaner exhaust output.
• The OEM 4394838 SCR unit is engineered specifically for Cummins X15 engines from 2018 to 2024,
ensuring correct fitment and seamless integration with the original aftertreatment system.
• Designed to work with the DEF dosing system, this SCR component supports balanced exhaust treatment,
helping maintain effective NOx reduction and efficient DEF usage throughout driving conditions.
• Installing the proper OEM SCR assembly helps reduce the likelihood of warning lights, fault codes, and derate conditions,
minimizing interruptions and unnecessary diagnostic time.
• A well-maintained SCR system also helps protect other aftertreatment parts by minimizing excessive emissions buildup,
supporting longer service life and smoother overall operation.
• Choosing a quality OEM replacement like the Cummins X15 SCR 2018–2024: OEM 4394838 gives you confidence in durability,
proper system integration, and dependable emissions control performance.
Selecting the right SCR assembly plays a major role in preserving your Cummins X15 exhaust aftertreatment system. The OEM 4394838 SCR unit delivers proper fit and reliable operation to support cleaner emissions, reduce downtime, and help your truck perform at its best. At Tamerx Diesel Parts, we offer trusted diesel components to help keep your engine compliant and road-ready mile after mile.


















































