Cummins ISB 6.7L, QSB NOx Sensor 2018-2024: OEM 4326861
CUMMINS ISB 6.7L, QSB NOX SENSOR 2018-2024: OEM 4326861
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 4326861-OE ( OEM Part Number 4326861 ).This part is primarily made for a Cummins ISB 6.7L, QSB, 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 | 4326861 |
| Additional OEM | 4326861 |
ADDITIONAL DETAILS
| CONDITION | Genuine New |
| UPC / Barcode | 00840490554856 |
| WEIGHT | 2.00 LBS |
SHIPPING OPTIONS
Ship Weight : 2.00 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"
Designed for accurate emissions monitoring and system feedback, the Cummins ISB 6.7L / QSB NOx Sensor (2018–2024) OEM 4326861 is a critical component within the exhaust aftertreatment system. Built to meet original equipment specifications, it ensures precise compatibility with Cummins ISB 6.7L and QSB engines across the specified model years. This sensor measures nitrogen oxide (NOx) levels in the exhaust stream and relays real-time data to the engine control module, allowing proper regulation of emissions processes. NOx sensors play a key role in the selective catalytic reduction (SCR) system, helping convert harmful gases into less harmful compounds. Constructed from durable, high-quality materials, it is engineered to withstand high temperatures and demanding diesel operating conditions. Ideal for technicians and fleet maintenance professionals, this OEM sensor supports consistent system function and long-term reliability.
FITMENT CHART
| YEAR | MAKE | ENGINE(S) | ||||
|---|---|---|---|---|---|---|
| 2018 | Cummins | ISB 6.7L | QSB | |||
| 2019 | Cummins | ISB 6.7L | QSB | |||
| 2020 | Cummins | ISB 6.7L | QSB | |||
| 2021 | Cummins | ISB 6.7L | QSB | |||
| 2022 | Cummins | ISB 6.7L | QSB | |||
| 2023 | Cummins | ISB 6.7L | QSB | |||
| 2024 | Cummins | ISB 6.7L | QSB | |||
PEOPLE ALSO ASKS | BLOG(S)
The Cummins ISB 6.7L / QSB NOx Sensor (OEM 4326861) is an emissions monitoring component designed to measure nitrogen oxide (NOx) levels in the exhaust system. Used in 2018–2024 engines, it plays a key role in ensuring the aftertreatment system is working correctly.
What it is:
This sensor is installed in the exhaust stream—either before or after the SCR system—and is responsible for detecting the amount of NOx being produced during engine operation.
What it does:
- Measures NOx levels in real time
- It continuously detects the concentration of nitrogen oxides in the exhaust gases.
- Sends data to the engine control module (ECM)
- The sensor converts its readings into electrical signals, allowing the ECM to monitor emissions output.
- Supports SCR system operation
- The ECM uses this data to adjust Diesel Exhaust Fluid (DEF) dosing for proper emissions treatment.
- Helps maintain emissions compliance
- Accurate NOx readings ensure the engine stays within required environmental limits.
- Detects system inefficiencies
- Abnormal readings can indicate issues within the aftertreatment system, prompting corrective action.
- Enables real-time system adjustments
- The ECM relies on sensor feedback to fine-tune emissions control during operation.
In simple terms:
The Cummins 4326861 NOx sensor acts as the emissions monitor, constantly checking exhaust output and helping the system adjust so harmful gases are properly reduced.
A NOx sensor is generally not considered serviceable in the traditional sense. While some minor issues can be inspected or addressed, most NOx sensor problems ultimately require replacement rather than repair.
Because NOx sensors are sensitive electronic components that measure exhaust gases, their accuracy is critical. Once they begin to fail or provide incorrect readings, restoring reliable function is difficult without replacing the unit.
Here’s how to determine your options:
- Check for wiring or connection issues first
- Sometimes the problem isn’t the sensor itself. Damaged wiring, loose connectors, or corrosion can interfere with signals and may be repairable.
- Inspect for contamination or buildup
- In some cases, excessive soot or residue around the sensor may affect readings. However, cleaning rarely restores full accuracy.
- Run a diagnostic scan
- Fault codes can confirm whether the issue is sensor failure or related to another component in the system.
- Consider age and usage
- Over time, NOx sensors naturally degrade due to constant exposure to heat and exhaust gases, making replacement the more reliable option.
- Replace when accuracy is compromised
- If the sensor continues to provide incorrect readings or triggers recurring fault codes, replacement is typically necessary.
In short, while basic checks can rule out external issues, a failing NOx sensor is almost always replaced rather than repaired to ensure proper emissions system function.
The 4326861 NOx sensor measures nitrogen oxide levels in the exhaust stream and sends real-time data to the engine control module to regulate emissions output.
It is mounted within the aftertreatment system, often positioned upstream or downstream of the SCR catalyst to monitor exhaust gas composition.
It provides accurate NOx readings that allow the control module to adjust DEF dosing and other parameters to maintain proper emissions levels.
The sensor converts detected NOx levels into electrical signals that the ECM uses to make real-time adjustments to engine and aftertreatment operation.
Cummins NOx Sensors
