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 60DS21-2 ( OEM Part Number Q21-6170-002K1T ).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 | Q21-6170-002K1T |
| Additional OEM | Q21-6091, Q21-6127-002, Q21-6167-002, Q21-6167-002K1T, Q21-6167-002KIT, Q21-6170-002, Q21-6170-002K1T, Q216167-002 |
ADDITIONAL DETAILS
| CONDITION | Remanufactured |
| UPC / Barcode | 00840490540767 |
| 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"
Ensure reliable emissions monitoring with the Peterbilt / Kenworth Cummins X15 DEF Sensor (OEM Q21-6170-002K1T). This genuine OEM component is designed to measure diesel exhaust fluid level, temperature, and quality with precision, allowing your DEF system to function efficiently and remain compliant with emissions standards. Built to Cummins and OEM truck specifications, it ensures accurate data transmission and dependable performance. The rugged, weather-resistant construction provides long-lasting durability even under extreme operating conditions. Count on Tamerx Diesel Products LLC for authentic replacement parts that keep your Cummins X15-powered trucks running smoothly and efficiently.
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)
The Q21-6170-002K1T is a specialized sensor for the Diesel Exhaust Fluid (DEF) system in heavy-duty trucks. Its primary role is to monitor both the level and the concentration (quality/purity) of the DEF fluid in the tank. According to its product description, it is classified as a “Level & Concentration Sensor.”
By performing these measurements, the sensor enables the after-treatment system to ensure the correct amount of DEF is available and that the fluid meets required specifications. This is vital for the Selective Catalytic Reduction (SCR) system to function properly and for the engine to remain compliant with emissions regulations.
Why This Function Matters
- Having accurate fluid level data prevents the system from running out of DEF, which could trigger fault codes or derate conditions.
- Monitoring concentration/quality ensures the fluid is usable — if the DEF is too diluted or contaminated, it may not properly reduce nitrogen oxides (NOx).
- With both level and quality known, the engine control module (ECM) or emissions controller can make informed decisions about dosing, alerts and system adjustments.
- Using the correct OEM sensor like Q21-6170-002K1T ensures compatibility with the wiring, calibration and diagnostics built into the vehicle.
he Q21-6170-002K1T sensor is essential for managing the DEF system’s health — measuring how much fluid is there and how good it is. It protects emissions compliance, system reliability, and helps avoid penalties or downtime caused by DEF-system faults.
The Diesel Exhaust Fluid (DEF) sensor is a vital part of your vehicle’s emissions system, responsible for monitoring fluid level, temperature, and quality. Like any electronic component, it has a limited lifespan — but with proper care, it can last for many miles before needing replacement.
In most cases, a DEF sensor lasts between 100,000 and 150,000 miles. However, this can vary depending on driving habits, environmental conditions, and DEF fluid quality. Extreme heat, cold, or contamination can shorten the sensor’s life significantly.
Factors that affect DEF sensor lifespan include:
- DEF fluid contamination from dirt or expired fluid
- Crystallization caused by infrequent vehicle use or poor storage
- Extreme temperatures that stress sensor components
- Wiring corrosion or damaged connectors
To extend the life of your DEF sensor, always use fresh, certified DEF, store it in a clean container, and check your system during regular maintenance intervals.
If you start seeing DEF system warnings, inaccurate readings, or reduced speed mode, have your system inspected right away. Replacing a failing sensor early helps maintain emissions compliance and prevents costly downtime.
Conditions include crystallised DEF fluid, contaminated tank or connections, thermal stress/vibration, or damaged wiring/connectors.
Regularly check and clean the DEF tank and fill port, avoid crystal buildup, inspect wiring harnesses and connectors for damage, and ensure correct DEF fluid quality.
It ensures accurate DEF quality and level data are sent to the SCR system, helping maintain proper NOx reduction and EPA compliance.
The ECM may think the DEF fluid is contaminated, which can trigger fault codes, limit power, or put the truck into derate mode.
Cummins DEF Sensors
