
Cummins QSB 6.7L NOx Sensor 2018-2024: OEM 5461550
CUMMINS QSB 6.7L NOX SENSOR 2018-2024: OEM 5461550

ORDERS PLACED BEFORE 3PM EST WILL SHIP SAME DAY

WARRANTY
1M MILES OR 1 YEAR
PRODUCT DESCRIPTION
This is a Genuine New, Cummins NOx Sensor, Cummins part number 5461550OE ( OEM Part Number 5461550 ).This part is primarily made for a Cummins QSB 6.7L, production years 2018-2024, and comes with a One Million Miles or One Year Warranty. For additional warranty info Click Here
OEM NUMBERS
| Primary OEM | 5461550 |
| Additional OEM | 5461550 |
ADDITIONAL DETAILS
| CONDITION | Genuine New |
| UPC / Barcode | 00840490552845 |
| WEIGHT | 1.00 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.
Built for 2018–2024 Cummins QSB 6.7L applications, the NOx Sensor with OEM 5461550 is a critical component of the emissions aftertreatment system. This sensor continuously monitors nitrogen oxide (NOₓ) levels in the exhaust stream and sends accurate data to the engine control module (ECM), enabling precise control of diesel exhaust fluid (DEF) dosing and SCR (Selective Catalytic Reduction) performance. Reliable NOx feedback helps the ECM maintain emissions compliance and optimize aftertreatment operation across varying conditions, while also helping reduce the likelihood of emissions-related warning lights or diagnostic fault codes. This page provides application-specific information to assist with identifying the Cummins QSB 6.7L NOx Sensor 2018–2024 (OEM 5461550) for service and replacement needs.
FITMENT CHART
| YEAR | MAKE | ENGINE(S) | ||||
|---|---|---|---|---|---|---|
| 2018 | Cummins | QSB 6.7L | ||||
| 2019 | Cummins | QSB 6.7L | ||||
| 2020 | Cummins | QSB 6.7L | ||||
| 2021 | Cummins | QSB 6.7L | ||||
| 2022 | Cummins | QSB 6.7L | ||||
| 2023 | Cummins | QSB 6.7L | ||||
| 2024 | Cummins | QSB 6.7L | ||||
PEOPLE ALSO ASKS | BLOG(S)
The Cummins QSB 6.7L NOx Sensor, OEM 5461550, is an emissions monitoring sensor used in 2018–2024 applications. Its job is to measure nitrogen oxide (NOx) levels in the exhaust stream and send that information to the engine control module (ECM) so the aftertreatment system can operate correctly.
This sensor is especially important for engines equipped with SCR (Selective Catalytic Reduction) systems, because NOx readings help control DEF dosing and verify emissions conversion.
- Step 1: Exhaust passes over the sensing probe
- The sensor is installed directly in the exhaust stream. As exhaust gases flow past the sensor tip, the sensing element detects NOx concentration.
- Step 2: The sensor converts gas concentration into an electrical signal
- Inside the sensor is a specialized sensing element that reacts to NOx molecules. That reaction produces a signal that represents how much NOx is present in the exhaust.
- Step 3: Built-in electronics process the signal
- Most Cummins NOx sensors include internal electronics that:
- stabilize and interpret the raw signal
- compensate for exhaust temperature changes
- convert readings into data the ECM can use
- Most Cummins NOx sensors include internal electronics that:
- Step 4: Data is sent to the ECM
- The ECM receives the NOx reading and uses it to:
- manage DEF dosing amounts
- monitor SCR efficiency
- confirm emissions are being reduced properly
- Step 5: The system adjusts operation if readings are abnormal
- If NOx levels are too high (or the sensor signal is incorrect), the ECM may trigger:
- SCR/DEF warning lights
- fault codes
- reduced operation / derate conditions
- If NOx levels are too high (or the sensor signal is incorrect), the ECM may trigger:
The Cummins NOx Sensor (OEM 5461550) works by detecting NOx in the exhaust, converting it into a signal, and providing real-time feedback to the ECM to control SCR operation and emissions compliance for QSB 6.7L engines from 2018–2024.
The signs of a bad NOx sensor usually show up as emissions warnings, SCR/DEF system faults, and derate conditions. Since the NOx sensor helps the ECM control DEF dosing and monitor NOx reduction, a failing sensor can quickly trigger repeated fault codes—even if the SCR catalyst is still good.
Common signs of a bad NOx sensor
- Check engine light / emissions warning light
- Often the first noticeable sign.
- NOx sensor fault codes
- Codes may indicate sensor circuit failure, heater faults, signal out of range, or “NOx sensor performance” issues.
- SCR efficiency / NOx conversion fault codes
- A bad NOx sensor can falsely make it appear the SCR is failing, triggering “SCR efficiency below threshold” type codes.
- Derate / restricted mode
- Many vehicles will limit operation when emissions sensors fail or readings are unreliable.
- Abnormal DEF dosing behavior
- You may notice increased DEF usage, dosing-related warnings, or inconsistent DEF system operation.
- Poor regeneration/emissions system behavior
- Inaccurate NOx readings can cause the emissions system to operate incorrectly and trigger repeated events or warnings.
- Fault codes that return quickly after clearing
- If codes reappear shortly after reset, it often points to a failing sensor rather than a temporary issue.
A bad NOx sensor is typically identified by persistent NOx sensor-related fault codes, repeated SCR efficiency warnings, abnormal DEF behavior, and recurring derate conditions. In most cases, replacement is the most reliable solution.
It measures exhaust nitrogen oxide levels to help the engine manage emissions.
It is installed in the exhaust aftertreatment system where it can monitor NOx levels in the exhaust.
NOx monitoring helps ensure the aftertreatment system properly regulates emissions and stays within compliance.
The SCR (Selective Catalytic Reduction) system uses the NOx sensor’s data to adjust Diesel Exhaust Fluid (DEF) dosing.




































