Shop Cummins Doser Injector Kit ISX15 Left Side - wisentpartscenter.com

Description

The Genuine Cummins 4972999 Doser Injector Kit is an aftertreatment fuel doser injector used on select Cummins ISX/QSX 15L engines. This component meters diesel fuel into the exhaust aftertreatment stream to support diesel particulate filter regeneration and emissions-system operation. It is not a main engine cylinder injector and should not be confused with a DEF dosing injector. A worn, restricted, leaking, or failed doser injector can affect regeneration performance, increase soot loading, and trigger aftertreatment-related fault codes. For ISX/QSX 15L applications, correct OEM part number matching is important because aftertreatment configuration, engine control module calibration, and emissions hardware can vary by engine serial number and vehicle application. Verify fitment by VIN, ESN, original part number, and Cummins service information before ordering.

Purpose of the Part

The 4972999 doser injector delivers a controlled amount of diesel fuel into the exhaust stream during aftertreatment operation. This supports temperature management and DPF regeneration so soot can be burned off properly. If the doser injector fails, the system may not reach the correct regeneration temperature, causing incomplete regen, high soot load, derate, or aftertreatment fault codes.

Issue Symptoms / When to Replace

Common signs of a failing or restricted Cummins 4972999 doser injector may include:

  • Failed or incomplete DPF regeneration
  • High soot load or frequent parked regen requests
  • Check engine light or aftertreatment warning light
  • Engine derate related to aftertreatment performance
  • Fuel leakage, clogging, carbon buildup, or poor spray pattern
  • Excessive exhaust smoke during regen
  • Related Cummins fault codes/SPNs may include aftertreatment fuel injector, fuel shutoff valve, or regeneration-performance faults such as SPN 3482 / FC1925, depending on engine control system and calibration

Brand Information

Cummins is the original engine manufacturer for the ISX/QSX 15L platform and supplies engine, fuel-system, and aftertreatment components for heavy-duty diesel applications. Genuine Cummins parts are engineered to match the engine’s ECM calibration, emissions strategy, and service requirements. For an aftertreatment doser injector, correct OEM fitment is important because fuel delivery accuracy directly affects regeneration performance and emissions-system reliability.

Installation Notes

Install 4972999 only after confirming the original part number and engine serial number. Inspect the mounting area, fuel line, sealing surfaces, harness connector, and aftertreatment piping for contamination, leaks, or carbon buildup. Follow the OEM service manual for torque specifications, priming, diagnostic tests, and final verification. A forced regen or aftertreatment service test may be required after installation.

How to Identify an OEM Part

An OEM Cummins 4972999 doser injector should be verified by the part number on the Cummins label, original packaging, and any stamped or marked identification on the component. Match the injector to the original part number, engine serial number, and Cummins service information. Avoid relying only on visual appearance because aftermarket doser injectors may look similar but differ in flow rate, sealing quality, or application compatibility.

Technical Documents

Why buy 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

Warrany & 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.

Cummins

Genuine Cummins parts for heavy-duty trucks. Browse OEM Cummins turbochargers, turbo actuators, fuel injectors, fuel pumps, EGR components, sensors, and more for ISB 6.7L, ISX15, ISL 8.9L, and other Cummins diesel engines.

View all