Peterbuilt/ Kenworth Paccar PX7, PX9, MX13 DEF Sensor
PETERBUILT/ KENWORTH PACCAR PX7, PX9, MX13 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 60DS21-5 ( OEM Part Number Q21-6170-002K1T ).This part is primarily made for a Paccar PX7, PX9, MX13, 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 | 00840490540828 |
| 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 operating efficiently with the Peterbilt / Kenworth Paccar PX7, PX9, MX13 DEF Sensor (2015–2022, OEM Q21-6170-002K1T). This genuine OEM component is designed to accurately measure diesel exhaust fluid level, temperature, and quality, ensuring proper DEF system performance and emissions compliance. Built to Paccar, Peterbilt, and Kenworth specifications, it provides precise data communication with the engine control module for consistent reliability. The sensor’s durable construction resists heat, vibration, and chemical exposure, offering dependable service life in demanding conditions. Trust Tamerx Diesel Products LLC for authentic DEF system replacement parts that help maintain efficiency, reliability, and long-term durability for your Paccar-powered trucks.
FITMENT CHART
| YEAR | MAKE | ENGINE(S) | ||||
|---|---|---|---|---|---|---|
| 2015 | Paccar | PX7 | PX9 | MX13 | ||
| 2016 | Paccar | PX7 | PX9 | MX13 | ||
| 2017 | Paccar | PX7 | PX9 | MX13 | ||
| 2018 | Paccar | PX7 | PX9 | MX13 | ||
| 2019 | Paccar | PX7 | PX9 | MX13 | ||
| 2020 | Paccar | PX7 | PX9 | MX13 | ||
| 2021 | Paccar | PX7 | PX9 | MX13 | ||
| 2022 | Paccar | PX7 | PX9 | MX13 | ||
PEOPLE ALSO ASKS | BLOG(S)
The DEF Sensor (OEM Q21-6170-002K1T) is an essential component in the emission control system of Peterbilt and Kenworth trucks equipped with PACCAR PX7, PX9, and MX13 engines. This sensor plays a key role in monitoring the Diesel Exhaust Fluid (DEF) used in the Selective Catalytic Reduction (SCR) system, ensuring emissions remain within regulatory standards.
How It Works
The Q21-6170-002K1T sensor performs two main functions:
- Measures DEF Level
- It detects how much DEF is in the tank, allowing the system to alert the driver when fluid levels are low.
- Monitors DEF Quality
- It checks the fluid’s concentration or purity, verifying that the urea-to-water ratio meets the proper specifications for effective NOx reduction.
Once the sensor gathers this data, it sends electrical signals to the vehicle’s after-treatment control module. The system then determines whether the DEF fluid is adequate for emission control or if issues such as low fluid, contamination, or dilution exist.
Why It’s Important
- Ensures the SCR system operates efficiently and accurately.
- Maintains compliance with strict emission regulations.
- Prevents costly downtime caused by inaccurate DEF readings.
- Protects the engine and after-treatment components from damage.
- Guarantees proper integration and calibration with OEM systems.
The Q21-6170-002K1T sensor might seem small, but it plays a big role in keeping your PACCAR-powered truck running clean, compliant, and reliable.
A Diesel Exhaust Fluid (DEF) sensor is essential for monitoring fluid level, quality, and temperature in your vehicle’s emissions system. When it begins to fail, you may notice warning lights or experience reduced engine performance. Proper diagnosis is key to confirming the issue before replacing parts unnecessarily.
Common symptoms of a bad DEF sensor include:
- DEF warning light or Check Engine Light on the dashboard
- Incorrect DEF level readings
- Reduced engine power or derate mode
- Fault codes related to the emissions system
Steps to diagnose a faulty DEF sensor:
- Scan for diagnostic trouble codes (DTCs)
- using a professional scan tool. Look for codes tied to DEF level, quality, or temperature sensors.
- Inspect wiring and connectors
- for corrosion, loose fittings, or damaged insulation.
- Check DEF fluid quality
- contaminated or old DEF can mimic sensor failure.
- Review live data readings
- in your diagnostic software; erratic or missing values often confirm sensor issues.
If all other causes are ruled out, the DEF sensor should be replaced to restore accurate system monitoring. Prompt diagnosis helps maintain emissions compliance and prevents costly downtime.
While it may still drive, ignoring the fault can lead to engine derate, emissions non-compliance, and potential after-treatment damage — prompt replacement is advised.
Use certified DEF fluid, keep the fill port and tank clean of crystals, inspect wiring/connectors, and avoid exposing the unit to extreme heat or contamination.
Yes, a failing sensor can send inaccurate readings to the ECM, triggering low-level alerts even when the DEF tank is full.
Light cleaning of external buildup may help temporarily, but internal sensor degradation or contamination requires full replacement.
Paccar DEF Sensors
