Loading...

Cummins QSB 6.7L, 4.5L NOx Sensor 2018-2024: OEM 5491422

CUMMINS QSB 6.7L, 4.5L NOX SENSOR 2018-2024: OEM 5491422

Shipping ICON

ORDERS PLACED BEFORE 3PM EST WILL SHIP SAME DAY

WARRANTY ICON

WARRANTY
1M MILES OR 1 YEAR

$695.00

AVAILABILITY IN STOCK
OEM NUMBER5491422
PART TYPENOx Sensor
BRANDCummins
ENGINE MAKECummins
ENGINE TYPEQSB 6.7L, 4.5L
YEAR2018-2024
PART NUMBER5491422OE
APPLICATION NOTESStage5 B4.5, Hyundai

PRODUCT DESCRIPTION

This is a Genuine New, Cummins NOx Sensor, Cummins part number 5491422OE ( OEM Part Number 5491422 ).This part is primarily made for a Cummins QSB 6.7L, 4.5L, production years 2018-2024, and comes with a One Million Miles or One Year Warranty. For additional warranty info Click Here

OEM NUMBERS

Primary OEM5491422
Additional OEM5491422

ADDITIONAL DETAILS

CONDITIONGenuine New
UPC / Barcode00840490552760
WEIGHT1.00 LBS

SHIPPING OPTIONS

Ship Weight : 1.00 LBS
UPS Ground, 2nd Day Air, Next Day Air

SHIPPING POLICY

Tamerx Diesel Products ships via UPS Ground. Next day air shipping can be arranged for a reasonable price of anywhere from $50.00 - $100.00 depending on the weight of the product and your location. We will do everything we can to make sure that you get the service you need. We understand how important it is to receive your order as quickly as possible.
In most cases Tamerx Diesel Products only needs one address, as long as your product is shipping to the same location as your billing information. In order to eliminate credit card fraud, your billing information must match the credit card you provide.

The terms, conditions, and details of our warranty vary from product to product. Specific warranty details can be found below.

Tamerx Diesel Products provides a replacement warranty on all of our parts. The duration and mileage limitations of the warranty vary by product and are specified on the product's detail page/item listing.

Please note that the warranty covers replacement of the part and the cost of shipping the replacement part to you only. It does not cover any shop, labor, towing, or any similar or related costs. This is not a "money back guarantee".

If you experience a problem with your part or it is not functioning properly, the correct warranty procedure is to call us at (510) 257-1777 (8:00 AM - 5:00 PM ET Monday through Friday). Be sure to have your order number and/or other relevant order information ready so we can easily locate your order and resolve your issue as quickly as possible. From that point, we will review with you any troubleshooting steps that may need to be taken and other areas or systems that can be checked to rule out external problems contributing to your part's issue. If a replacement is determined to be necessary, we will then arrange for your replacement part to ship out ASAP and issue any necessary return shipping labels and/or documents.

As is the case for the majority of the diesel products sold on Tamerx Diesel Products, your part's warranty is active as soon as you install it. In some other cases, warranty activation is contingent upon you sending us your core (i.e., your old part). Tamerx Diesel Products will provide you a return shipping label for parts that have a warranty with a core return condition. When we have received your core return, the part's warranty coverage begins. We reserve the right to void the product warranty if your core is not received within the allotted time, or if it isn't received at all. If the warranty for the diesel part you are purchasing has a core return requirement, it will be clearly noted on the product detail page/item listing.

What is a Core Charge?

A core charge (also called "core deposit") is similar to the deposit you might pay for a can or bottle of soda and is a standard requirement in the auto parts industry. For example, in many states, to promote recycling, you pay a deposit when you purchase a can of soda and receive your deposit back when you return the empty can. Many automotive parts have a core charge, or core price, that works in essentially the same way as a soda can deposit.

30 Day Core Charge Hold

You authorize Tamerx Diesel Products, to hold your credit card for the specified core charge amount and that you agree to return your core with 30 days of receiving the purchased part. When we have received your core return, the hold is released and the core charge payment is canceled.

The customer, or parts buyer, is responsible for any shipping costs associated with core returns unless otherwise specified in the product listing/detail page. Tamerx Diesel Products offers prepaid UPS shipping labels (SKU numbers UPS-CR1 and UPS-CR2) for use in returning your core that are available for purchase on our website during your shopping/order process.

The shipping label you will need to use for the core return is dependent upon what part you are purchasing. UPS-CR1 is good for cores weighing up to 20 pounds. UPS-CR2 is appropriate for shipping cores weighing 21 pounds or more. You must include enough information with the core return that clearly identifies it as a.) a Core Return, and b.) contains enough information we can use to clearly associate the core return with your order. Including a copy of the invoice or packing slip that came with the original shipment, clearly marked "Core Return", is ideal. Alternately, you can include a note marked as "Core Return" that includes your order number, full name and address, and phone number or other contact information. Failure to include this information with your returned core will most likely delay any due core credit being issued and/or delay any applicable warranty activation. Core returns need to be for the exact part purchased and cannot be damaged. Substituting another part in place of the part you have purchased is not acceptable.

All fluids must be drained.

If you have purchased a set or a parts package, you will need to return cores for all components of the set. For example, if you have purchaed a high pressure oil pump with an IPR valve, you will need to return both HPOP and IPR valve cores to receive proper credit. If you have purchased an EGR cooler/EGR valve package, your core return must consist of an EGR cooler core and an EGR valve core, or core credit will not be given.

Core Charges are often mandated by state legislature, and, as such, the actual core charge and taxes on the charge may vary depending on the state in which you buy your part. The Tamerx Diesel Products core charge presented to you online today with your item is representative of the most common core charge.


Designed for 2018–2024 Cummins QSB 6.7L and 4.5L applications, the NOx Sensor (OEM 5491422) is an essential component of the emissions aftertreatment system. This sensor monitors nitrogen oxide (NOₓ) levels in the exhaust stream and sends accurate data to the engine control module (ECM) to support proper SCR system operation. Reliable NOx readings help manage diesel exhaust fluid (DEF) dosing and maintain compliance with applicable emissions standards across these model years. Proper sensor operation can also help reduce the likelihood of emissions-related warning lights and diagnostic fault codes. This page provides application-specific information to assist with accurate identification of the Cummins QSB 6.7L / 4.5L NOx Sensor OEM 5491422 for service and replacement needs.

FITMENT CHART

YEARMAKEENGINE(S)
2018Cummins QSB 6.7L 4.5L
2019Cummins QSB 6.7L 4.5L
2020Cummins QSB 6.7L 4.5L
2021Cummins QSB 6.7L 4.5L
2022Cummins QSB 6.7L 4.5L
2023Cummins QSB 6.7L 4.5L
2024Cummins QSB 6.7L 4.5L

PEOPLE ALSO ASKS | BLOG(S)

The Cummins NOx Sensor, OEM 5491422, is important because it helps the engine and aftertreatment system measure nitrogen oxide (NOx) levels in the exhaust. That information is essential for controlling the SCR system, managing DEF dosing, and keeping 2018–2024 Cummins QSB 6.7L and 4.5L applications compliant with emissions regulations.

In simple terms, this sensor acts like the emissions system’s “feedback monitor.” Without accurate NOx readings, the engine cannot properly manage emissions treatment.

Why OEM 5491422 matters for your engine

  • Controls DEF dosing accuracy
    • The engine control module uses NOx sensor data to determine how much DEF to inject. Incorrect readings can cause under-dosing or over-dosing.
  • Supports SCR efficiency
    • NOx sensors help confirm the SCR catalyst is reducing NOx correctly. If conversion efficiency drops, fault codes can appear.
  • Helps prevent warning lights and derate conditions
    • When the NOx sensor fails or sends inaccurate signals, it can trigger check engine lights and reduced operation modes.
  • Protects aftertreatment components
    • Bad sensor data can lead to improper DEF use, crystallization risk, and strain on SCR and related emissions parts.
  • Maintains emissions compliance
    • Since NOx output is regulated, this sensor is essential for keeping the engine within required limits.

The Cummins NOx Sensor (OEM 5491422) is important because it directly supports emissions control, SCR operation, and reliable system communication in Cummins QSB 6.7L and 4.5L engines from 2018–2024.

Yes, you can often still drive if a NOx sensor goes bad, but it should only be considered a short-term option, not a long-term solution.

A NOx sensor monitors emissions levels so the ECM can control DEF dosing and SCR operation. When it fails, the system can no longer accurately measure NOx reduction, which usually triggers warning lights and protective actions.

What happens if you keep driving with a bad NOx sensor?

Driving with a failing NOx sensor may cause:

  • Check engine / emissions warning lights
    • NOx sensor fault codes typically stay active and return repeatedly.
  • Derate or restricted mode
    • Many vehicles limit operation when emissions sensors fail, even if the engine still runs.
  • Incorrect DEF dosing behavior
    • The system may over-dose or under-dose DEF because it can’t confirm NOx conversion.
  • SCR efficiency fault codes
    • A bad NOx sensor can make it look like the SCR is failing, even when it isn’t.
  • Possible no-start countdown (on some systems)
    • Some vehicles will eventually prevent restarting until the issue is repaired.

You may be able to drive temporarily, but it’s not recommended to continue driving with a bad NOx sensor. It can lead to repeated derate conditions and emissions shutdown risks. Replacement should be handled as soon as possible to restore proper SCR function and avoid costly secondary issues.

Yes, it contains sensing elements that generate electrical signals based on NOx concentration.

Yes, soot contamination, heat, and harsh exhaust conditions can impact sensor longevity.

It sends NOx level data to the engine control module (ECM) for emissions management.

The correct OEM sensor helps ensure accurate NOx monitoring and proper aftertreatment system function.

Cummins NOx Sensors

PRODUCT VIDEOS