Cummins QSB 3.3L SCR Filter 2018-2024: OEM 4353971

Reliable NOx Reduction Support for Cummins QSB 3.3L Engines (2018–2024)

What is it?
The Cummins QSB 3.3L SCR Filter (OEM 4353971) is an emissions aftertreatment component designed for Cummins QSB 3.3-liter diesel engines produced between 2018 and 2024. As part of the Selective Catalytic Reduction (SCR) system, this filter helps enable the conversion of nitrogen oxides (NOx) into less harmful gases through interaction with Diesel Exhaust Fluid (DEF).

Why choose this SCR Filter?
Built to Cummins’ original specifications, this SCR filter is designed for proper fitment and compatibility with factory aftertreatment systems. SCR components play a crucial role in emissions control by ensuring exhaust gases are properly treated before release. Over time, contamination or reduced efficiency can impact performance and trigger emissions alerts. Replacing the filter with the correct OEM-specified unit helps maintain consistent exhaust treatment and system balance.

Cummins emphasizes that genuine components are engineered for compatibility, durability, and reliable performance within their engine systems. 

Key Benefits
✅ Designed for Cummins QSB 3.3L engines (2018–2024)
✅ Supports NOx reduction through SCR operation
✅ Helps maintain proper DEF-based emissions treatment
✅ Direct replacement — no modifications required
✅ Built for high-temperature, heavy-duty environments

Applications
This SCR filter is commonly used in light- to medium-duty vehicles and equipment powered by Cummins QSB 3.3L engines. Typical applications include delivery vehicles, construction equipment, industrial machinery, and other diesel platforms where emissions compliance and consistent aftertreatment performance are required.

Installation Notes
Before servicing, allow the exhaust and aftertreatment system to fully cool. Remove the existing SCR filter and inspect nearby components such as DEF lines, sensors, and mounting hardware for buildup or damage. Install the replacement filter using proper clamps and seals to ensure a secure fit. After installation, clear any stored fault codes and verify correct SCR system operation through diagnostics.

Final Thoughts
If your Cummins QSB 3.3L-equipped equipment is experiencing emissions warnings or inconsistent aftertreatment performance, replacing the SCR filter with the correct OEM component can help restore proper exhaust treatment. The Cummins QSB 3.3L SCR Filter (OEM 4353971) plays a key role in maintaining compliant emissions output and dependable engine operation.