wp20545 - Genuine Cummins Outlet Catalyst Module - 1 - wisentpartscenter.com

Description

Cummins 5418550 Outlet Catalyst Module - Genuine Cummins SCR Outlet

The Cummins 5418550 is a genuine Cummins outlet catalyst module, the final catalyst stage in the aftertreatment assembly. It houses the SCR catalyst, where diesel exhaust fluid injected upstream reacts with NOx and converts it to nitrogen and water before the exhaust leaves the system.

Key Functions:

- Final catalyst stage in the aftertreatment assembly
- Houses the SCR catalyst for NOx conversion
- Works with the upstream mixer and DEF dosing to complete the reaction

Fitment & Specifications:

- Engine: Cummins B6.7
- Emissions: EPA 2017 and EPA 2021
- Position: SCR outlet module, last stage in the assembly

Verify fitment with us before ordering to ensure the correct part for your application.

Purpose of the Part

The 5418550 is where NOx reduction actually happens. Diesel exhaust fluid is injected and mixed into the exhaust stream upstream of this module. Inside the catalyst, the ammonia from that DEF reacts with NOx and converts it to nitrogen and water vapour. Everything ahead of it - the DOC, the DPF, the mixer, the dosing hardware - exists to deliver exhaust to this module in the condition the reaction needs.

Issue Symptoms / When to Replace

Low NOx conversion efficiency codes, SCR efficiency faults, and aftertreatment derate. DEF consumption that climbs without a matching drop in NOx readings. Faults that return after the NOx sensors and DEF dosing hardware have been checked and cleared.

Confirm the NOx sensors and the DEF dosing system first. Both produce conversion efficiency faults that look identical to a dead catalyst, and both are cheaper to replace.

Brand Information

Cummins has built diesel engines since 1919 and is one of the largest independent engine manufacturers in the world. Its Cummins Emission Solutions division builds the complete aftertreatment assembly, and publishes each module as part of a matched top level assembly rather than as a standalone part.

Installation Notes

Check the DEF dosing system and NOx sensors before installing. A catalyst that was poisoned or contaminated by a dosing fault will not survive long behind the same fault.

How to Identify an OEM Part

Cummins logo and Cummins part number on the housing. Confirm the number matches 5418550. Cummins catalogs this part as an Outlet Catalyst Module.

Why Buy 5418550 from Wisent Parts

  • ⏱️
    Fast shipping
    Orders before 12PM EST ship same business day.
  • 🛡️
    180-day warranty
    All parts covered from delivery date.
  • ↩️
    Easy returns
    30-day returns.
  • ✅
    Verify fitment
    Send VIN/ESN and we’ll confirm.

Shop with confidence

Warranty & Return Information
Warranty Information

Wisent Parts offers a 180-day warranty on all parts from the date of delivery. This warranty covers orders placed directly through our website. If a part fails during this period, we’re here to help - whether it’s a replacement, repair, or refund. For full details, refer to the Warranty page.

Return Information

Wisent Parts accepts returns within 30 days of delivery. All returns are subject to a restocking fee. To qualify, parts must be unused and in their original condition. For full return instructions and restocking fee details, please refer to the Returns page.