Diesel engines depend on advanced emissions components to reduce harmful exhaust pollutants, and the Cummins X15 / X12 / MX13 DOC Filter (2018–2024, OEM 4394834) is a vital part of that system. The Diesel Oxidation Catalyst (DOC) filter helps convert carbon monoxide and unburned hydrocarbons into less harmful gases before they move through the rest of the emissions system. Choosing the correct OEM-grade DOC filter ensures effective emissions control, smoother engine operation, and long-term reliability.
This DOC filter plays an important role in your engine’s emissions system — here’s why it matters:
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Improves Exhaust Quality – Assists in transforming carbon monoxide and hydrocarbons into safer compounds, contributing to cleaner overall emissions.
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Supports Downstream Emissions Components – By reducing pollutant load early in the exhaust stream, the DOC filter helps downstream systems like SCR and particulate filters work more efficiently.
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Helps Maintain Emissions Compliance – Installing the proper DOC filter helps ensure your engine continues to meet regulatory standards without triggering warning codes or derate conditions.
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OEM-Grade Fit and Durability – As OEM 4394834, this DOC matches original equipment specifications for size, materials, and performance, ensuring dependable long-term operation.
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Prevents Exhaust System Issues – Replacing a worn or clogged DOC filter can improve throttle response, reduce backpressure, and help support smoother exhaust flow.
A failing or restricted DOC filter can lead to reduced emissions efficiency, decreased performance, and potential system warnings. The Cummins X15 / X12 / MX13 DOC Filter (OEM 4394834) provides the OEM-standard quality and emissions support needed to help your engine run cleaner and more efficiently. For customers seeking a dependable replacement part, Tamerx offers high-quality components engineered to support long-lasting emissions performance and reliable engine operation.






