5418505 - Genuine Cummins (Diesel Oxidation Catalyst) DOC Outlet - 1 - wisentpartscenter.com

Description

Genuine Cummins 5418505RX Outlet Catalyst Module is an exhaust aftertreatment component used at the outlet stage of the SCR system, where catalyst chemistry supports final NOx conversion before exhaust exits the aftertreatment assembly.

Key Functions

- Provides the outlet catalyst stage of the SCR aftertreatment system.
- Supports conversion of nitrogen oxides (NOx) after DEF has been introduced into the exhaust stream.
- Maintains the application-specific catalyst volume and exhaust-flow path required by the aftertreatment system.
- Works as part of a matched system with the upstream DOC, DPF, mixer, DEF dosing system, and SCR components.

Fitment & Specifications

- 15 liter ISX/QSX
- EPA17

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

Purpose of the Part

The 5418505RX is the outlet catalyst stage of the SCR system. DEF introduced upstream forms ammonia in the exhaust stream, which reacts with NOx across the SCR catalyst to produce primarily nitrogen and water before the exhaust leaves the system.

Issue Symptoms / When to Replace

- SCR or NOx conversion-efficiency fault codes.
- Higher-than-expected downstream NOx readings.
- Check-engine or aftertreatment warning lights.
- Emissions-related inducement or engine derate when an SCR efficiency fault remains active.
- Physical catalyst damage, contamination, or internal substrate deterioration found during inspection.

These symptoms do not automatically confirm catalyst failure; DEF dosing, NOx sensors, exhaust leaks, and upstream engine problems can produce similar faults.

Brand Information

Cummins develops diesel engines, power systems, and supporting emissions-control components. Cummins Emission Solutions specializes in aftertreatment technologies including SCR catalysts, diesel particulate filters, oxidation catalysts, dosing systems, and integrated emissions assemblies.

Installation Notes

Do not condemn the outlet catalyst from a conversion-efficiency code alone. Verify DEF quality and dosing, NOx sensor operation, exhaust integrity, and possible fuel, oil, or coolant contamination before replacement.

How to Identify an OEM Part

Identify 5418505RX by the permanent markings on the catalyst housing.

Why Buy 5418505RX 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.