Cummins X15, QSX15 SCR Filter 2011-2020: OEM 4377767

Effective NOx Conditioning for Cummins X15 & QSX15 Engines (2011–2020)

What is it?
The Cummins X15, QSX15 SCR Filter (2011–2020) with OEM part number 4377767 is an emissions aftertreatment component designed specifically for Cummins X15 and QSX15 diesel engines manufactured from 2011 through 2020. Installed as part of the Selective Catalytic Reduction (SCR) system, this filter prepares exhaust gases before they reach the SCR catalyst, where nitrogen oxides (NOx) are chemically reduced with Diesel Exhaust Fluid (DEF).

Why choose this SCR Filter?
This SCR filter is built to Cummins’ original specifications for the X15 and QSX15 platforms, ensuring a precise fit and reliable integration with DEF metering components, emissions sensors, and control systems. Over time, soot, ash, and other exhaust byproducts can accumulate in the filter and reduce its effectiveness, which can contribute to inconsistent NOx conditioning, higher backpressure, or emissions system alerts. Installing the correct OEM-specified SCR filter helps maintain smoother exhaust conditioning and supports stable emissions behavior.

Key Benefits
✅ Designed for Cummins X15 & QSX15 aftertreatment systems (2011–2020)
✅ Helps prepare exhaust gases for efficient NOx reduction
✅ Promotes coordinated interaction with DEF dosing and emissions sensors
✅ Direct replacement — no modifications required
✅ Built for heavy-duty exhaust environments and extended use

Applications
This SCR filter is suitable for medium- and heavy-duty trucks and commercial vehicles powered by Cummins X15 or QSX15 engines manufactured between 2011 and 2020. It’s commonly found in long-haul tractors, regional transport rigs, vocational trucks, and other commercial platforms where emissions control and regulated exhaust conditioning are important for daily operation.

Installation Notes
Before servicing, allow the exhaust and aftertreatment system to cool completely to avoid burns or damage. Remove the existing SCR filter and inspect the surrounding DEF lines, sensor connections, and mounting hardware for signs of soot buildup, wear, or damage. Install the replacement filter with proper seals and clamps to ensure a secure, leak-free fit. After installation, clear any stored system codes and verify correct emissions system behavior with appropriate diagnostics.

Final Thoughts
If your Cummins X15 or QSX15-equipped vehicle is showing NOx-related warnings, uneven emissions readings, or irregular aftertreatment performance, replacing the SCR filter with the correct OEM-specified unit can help restore steadier exhaust conditioning and more predictable system performance. The Cummins X15, QSX15 SCR Filter (OEM 4377767) plays a key role in managing regulated exhaust chemistry and supporting dependable engine operation across varied duty cycles.