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 60DS21-3 ( OEM Part Number Q21-6170-003K1T ).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 | Q21-6170-003K1T |
| Additional OEM | Q21-6092, Q21-6095, Q21-6127-003, Q21-6127-006, Q21-6127-007, Q21-6167-004, Q21-6170-003, Q21-6170-003K1T, Q21-6170-004, Q216127006, Q216127006K1, Q216170003K1T |
ADDITIONAL DETAILS
| CONDITION | Remanufactured |
| UPC / Barcode | 00840490540774 |
| 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"
Keep your emissions system functioning accurately with the Peterbilt / Kenworth Cummins X15 DEF Sensor (OEM Q21-6170-003K1T). This genuine OEM component is engineered to precisely monitor diesel exhaust fluid level, temperature, and quality, ensuring proper operation of the DEF system and compliance with emissions regulations. Built to Cummins and OEM specifications, it delivers accurate data transmission and a dependable fit for consistent performance. The durable, weather-resistant design offers long-lasting reliability even in demanding environments. Trust Tamerx Diesel Products LLC for authentic DEF system replacement parts that help maintain efficiency, reliability, and long-term operation of your Cummins X15-powered trucks.
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 DEF sensor (OEM Q21-6170-003K1T) used in Peterbilt and Kenworth trucks with Cummins X15 engines is a vital part of your emissions system. This sensor is designed to monitor both the quality and the level of Diesel Exhaust Fluid (DEF) in the tank, helping the engine’s after-treatment system function accurately and efficiently.
The data it collects allows the Selective Catalytic Reduction (SCR) system to inject the correct amount of DEF into the exhaust stream. This process converts harmful nitrogen oxide (NOx) emissions into harmless nitrogen and water vapor, keeping your engine compliant with environmental standards.
Key reasons this sensor is important:
- Ensures DEF quality by detecting fluid concentration and contamination
- Monitors fluid level to prevent the system from running empty
- Helps maintain emissions compliance with regulatory standards
- Prevents engine derate or fault codes caused by inaccurate readings
- Ensures full compatibility with Cummins X15 control systems
The Q21-6170-003K1T sensor might seem like a small component, but it plays a critical role in the reliability, efficiency, and compliance of your truck’s emission system. Without it, the engine cannot properly manage DEF dosing or maintain clean operation.
Driving with a failing Diesel Exhaust Fluid (DEF) sensor is not recommended. The DEF sensor monitors the level, temperature, and quality of the DEF fluid in your emissions system. When it fails, your vehicle’s computer can no longer verify DEF conditions, leading to inaccurate readings and system errors.
At first, you may only see a Check Engine Light or DEF warning. However, ignoring the problem can cause your truck to enter derate mode, a safety feature that limits engine power and speed to prevent emissions violations. Once this happens, your vehicle may only operate at reduced speeds — sometimes as low as 5 mph.
Risks of driving with a bad DEF sensor include:
- Sudden loss of speed
- due to system derate
- False DEF level readings
- leading to unexpected shutdowns
- Potential damage
- to emissions components
- Higher repair costs
- if the issue worsens
If you suspect a failing DEF sensor, schedule service immediately. A professional technician can scan for fault codes, confirm the issue, and replace the sensor before it causes costly downtime or towing.
It monitors both the Diesel Exhaust Fluid (DEF) quality/concentration and fluid level in the tank, ensuring the after-treatment system receives correct dosing.
Symptoms include DEF system warning lights, engine derate for after-treatment fault, erratic or incorrect DEF level readings, or concentration error codes.
The OEM ensures correct calibration, fit, connector compatibility, and reliable readings for DEF level/quality — essential for emissions compliance and system integrity.
Generally no — once the correct sensor is installed and wiring is connected, the system recognizes it. Clearing fault codes and verifying correct readings is recommended.
Cummins DEF Sensors
