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Cummins NOx Sensor 2018-2024: OEM 4326868

CUMMINS NOX SENSOR 2018-2024: OEM 4326868

Shipping ICON

ORDERS PLACED BEFORE 3PM EST WILL SHIP SAME DAY

WARRANTY ICON

WARRANTY
1M MILES OR 1 YEAR

$395.00

AVAILABILITY IN STOCK
OEM NUMBER4326868
PART TYPENOx Sensor
BRANDCummins
ENGINE MAKECummins
ENGINE TYPE
YEAR2018-2024
PART NUMBER4326868-OE

PRODUCT DESCRIPTION

This is a Genuine New Cummins NOx Sensor, Cummins part number 4326868-OE ( OEM Part Number 4326868 ). All parts are proudly remanufactured in the U.S.A. to the highest of OEM standards, and improvements are often applied to the original design in the remanufacturing process. This part is primarily made for a Cummins , production years 2018-2024, and comes with a One Million Miles or One Year Warranty. For additional warranty info Click Here

OEM NUMBERS

Primary OEM4326868
Additional OEM4326868

ADDITIONAL DETAILS

CONDITIONGenuine New
UPC / Barcode00840490554696
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.

"This Product Doesn't Have a Core"


The Cummins NOx Sensor (OEM 4326868) for 2018–2024 models is designed to monitor nitrogen oxide levels in the exhaust system, providing accurate data to the engine control unit for proper emissions control and system operation. Built to OEM specifications, it ensures reliable fitment and consistent performance in Cummins ISC and ISL applications. This sensor plays a key role in supporting aftertreatment processes, helping maintain clean emissions, efficient engine function, and compliance with current environmental standards.

FITMENT CHART

YEARMAKEENGINE(S)
2018Cummins
2019Cummins
2020Cummins
2021Cummins
2022Cummins
2023Cummins
2024Cummins

PEOPLE ALSO ASKS | BLOG(S)

Accurate emissions monitoring is essential for keeping diesel engines operating within required limits. The Cummins NOx sensor is a critical component that measures nitrogen oxide levels in the exhaust stream and sends real-time data to the engine control module (ECM). This information allows the system to adjust Diesel Exhaust Fluid (DEF) dosing and maintain proper aftertreatment performance.

  • Monitors NOx Levels in Real Time
    The sensor continuously measures nitrogen oxide concentration in the exhaust, providing the ECM with accurate data for emissions control.
  • Supports Precise DEF Dosing
    By analyzing NOx levels, the system can determine the correct amount of DEF needed for the SCR process, helping convert harmful gases into safer compounds.
  • Acts as a Feedback System for SCR Efficiency
    The sensor helps verify that the aftertreatment system is working correctly by comparing emissions before and after treatment.
  • Helps Prevent Emissions-Related Faults
    Accurate readings reduce the risk of incorrect dosing, warning lights, or system derates, helping maintain smooth engine operation.
  • Designed for Cummins Applications (2018–2024)
    Built to OEM 4326868 specifications, this NOx sensor is engineered for compatibility with Cummins engines, ensuring proper integration with the emissions system.

The NOx sensor plays a vital role in maintaining emissions accuracy and system balance. In Cummins engines, a dependable sensor ensures proper exhaust monitoring, supports SCR operation, and helps keep the entire aftertreatment system functioning as intended.

Testing a NOx sensor is essential for ensuring the SCR system can accurately monitor and reduce nitrogen oxide (NOx) emissions. The sensor provides real-time data to the engine control module, helping regulate Diesel Exhaust Fluid (DEF) dosing. When the sensor is not working correctly, it can lead to warning lights, poor emissions control, and engine derate. Proper testing helps confirm whether the sensor is functioning as expected.

  • Begin with a diagnostic scan tool to check for fault codes related to NOx sensor performance or communication issues.
  • Monitor live data from upstream and downstream NOx sensors to compare readings and verify that NOx levels decrease after the SCR system.
  • Check sensor response under different engine loads to ensure readings change appropriately with operating conditions.
  • Inspect wiring and connectors for corrosion, loose connections, or damage that may affect signal accuracy.
  • Verify the sensor’s heater circuit is working properly, as NOx sensors rely on heat to function correctly.
  • Perform a visual inspection for contamination or buildup on the sensor that could interfere with readings.
  • If readings are inconsistent, slow to respond, or do not match expected values, the sensor may be faulty.

Accurate testing of a NOx sensor involves both electronic diagnostics and physical inspection. Addressing sensor issues early helps maintain proper emissions control, prevent unnecessary repairs, and keep the SCR system operating efficiently.

 

Yes, exposure to heat and contaminants can cause wear or failure.

Signs may include warning lights, incorrect readings, or reduced system efficiency.

Yes, it needs proper exhaust temperatures to provide accurate readings.

Yes, soot or residue can interfere with its ability to measure gases accurately.

Cummins NOx Sensors