Peterbuilt/ Kenworth Cummins X15 DEF Sensor
PETERBUILT/ KENWORTH CUMMINS X15 DEF SENSOR
ORDERS PLACED BEFORE 3PM EST WILL SHIP SAME DAY
WARRANTY
1M MILES OR 1 YEAR
PRODUCT DESCRIPTION
This is a Remanufactured, Tamerx DEF Sensor, Tamerx part number 60DS21-1 ( OEM Part Number Q21-6170-001K1T ).This part is primarily made for a Cummins X15, production years 2015-2022, and comes with a One Million Miles or One Year Warranty. For additional warranty info Click Here
Additional Notes: DEF Sensor, Bayonet
OEM NUMBERS
| Primary OEM | Q21-6170-001K1T |
| Additional OEM | Q21-6039, Q21-6090, Q21-6127-001, Q21-6127-001K1T, Q21-6167-001, Q21-6167-001KIT, Q21-6170-001, Q21-6170-001K1T, Q21-6170-001KIT, Q216167-001 |
ADDITIONAL DETAILS
| CONDITION | Remanufactured |
| UPC / Barcode | 00840490540750 |
| WEIGHT | 3.00 LBS |
SHIPPING OPTIONS
Ship Weight : 3.00 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"
Maintain reliable emissions control with the Peterbilt / Kenworth Cummins X15 DEF Sensor (OEM Q21-6170-001K1T). This genuine OEM component is designed to accurately monitor diesel exhaust fluid level, temperature, and quality, ensuring optimal DEF system function and compliance with emissions standards. Built to meet Cummins and OEM truck specifications, it provides a perfect fit and dependable signal accuracy for consistent performance. The durable, weather-resistant construction ensures long service life even in harsh operating conditions. Trust Tamerx Diesel Products LLC for authentic replacement parts that help keep your Cummins X15-powered trucks operating efficiently and reliably.
FITMENT CHART
| YEAR | MAKE | ENGINE(S) | ||||
|---|---|---|---|---|---|---|
| 2015 | Cummins | X15 | ||||
| 2016 | Cummins | X15 | ||||
| 2017 | Cummins | X15 | ||||
| 2018 | Cummins | X15 | ||||
| 2019 | Cummins | X15 | ||||
| 2020 | Cummins | X15 | ||||
| 2021 | Cummins | X15 | ||||
| 2022 | Cummins | X15 | ||||
PEOPLE ALSO ASKS | BLOG(S)
This sensor is essentially a “quality / concentration sensor” for the DEF system. It monitors the condition of the fluid in the Diesel Exhaust Fluid reservoir and transmits information to the vehicle’s after-treatment control system so that the SCR (Selective Catalytic Reduction) system can operate properly.
Here’s what happens step by step:
- The sensor is installed in or near the DEF tank / delivery system, where it can measure properties of the fluid.
- It measures concentration / purity of the DEF (for example urea content) so the engine/after-treatment system knows whether the fluid is good quality.
- It may also monitor other parameters like fluid temperature or level (depending on the design) so that proper dosing and fluid delivery can be ensured. 4. The sensor converts the measured property (e.g., concentration) into an electrical signal which is sent to the engine or after-treatment ECU (Engine Control Unit).
- Based on that data, the system will decide if the DEF is good, or if an alert/fault is needed (e.g., if the fluid is too diluted, too contaminated, or out of spec). 6. If the sensor reports out-of-range results, the system may trigger a fault code, warning light or restrict the operation of the after-treatment system until the issue is resolved.
Why It Matters
- Ensuring the correct concentration of DEF is critical: if the fluid is off-spec, the SCR system can’t convert NOx emissions properly.
- A faulty sensor may lead to emissions non-compliance, degraded engine operation, increased wear or damage in after-treatment components.
- Using the correct sensor part number (Q21-6170-001K1T) for the X15 engine in Peterbilt/Kenworth trucks ensures compatibility with the wiring, signal calibration and control logic.
The Diesel Exhaust Fluid (DEF) sensor plays a vital role in keeping your emissions system compliant and your diesel engine running smoothly. It monitors DEF level, temperature, and quality — providing real-time data to your vehicle’s computer. When the sensor starts to fail, it can trigger dashboard warnings and limit engine operation.
Under normal conditions, DEF sensors are designed to last several years — often between 100,000 and 150,000 miles, depending on vehicle usage and operating conditions. However, lifespan can vary based on factors like:
- Frequent short trips that cause DEF crystallization
- Poor-quality or contaminated DEF fluid
- Extreme temperature changes
- Improper storage or maintenance of the DEF tank
You should consider replacement if you notice:
- Persistent DEF warning lights
- Inaccurate fluid readings
- Fault codes related to the DEF system
To extend sensor life, always use fresh, certified DEF fluid and keep the tank clean. Regular inspections during routine maintenance can help detect early signs of failure.
If a DEF sensor is confirmed faulty, prompt replacement ensures your vehicle stays efficient, compliant, and road-ready.
Symptoms include fault codes related to DEF concentration/level, engine derate, SCR faults or warning lights indicating after-treatment issues.
Because incorrect readings of DEF quality or level can lead to improper SCR dosing, increased NOx emissions, and non-compliance with emission standards.
In most cases no special programming is needed; after installation the system recognizes the correct signal — but clearing codes and verifying operation is recommended.
Common causes include contamination of DEF fluid, crystallization in the tank, damaged wiring/connector, vibration or thermal exposure.
Cummins DEF Sensors
