Q21-6127-001 Genuine Paccar DEF Concentration Sensor
SKU: 65969212760

Q21-6127-001 Genuine Paccar DEF Concentration Sensor

$160.16 $177.95
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Description

Q21-6127-001 Genuine Paccar DEF Concentration SensorPart details DESCRIPTION DEF Concentration Sensor CONDITION Used BRAND Paccar PART NUMBER Q21 6127 001 OTHER OEM PART NUMBERS THAT WILL WORK Q216127001, Q21 6170 001, Q216170001, Q21 6170 001K1T, Q216170001K1T, Q21 6170 001K1T, Q216167001, Q216167001K1T, Q21 6167 001K1T, Q21 6167 001, Q216127001K1T, Q21 6127 001K1T, Q21 6167 001K1T, Q216127001 Q21 6170 001K1T, Q216167001 Q216127001, Q216170001 Q216167001 Function of this part The aftertreatment system

Part details

DESCRIPTION DEF Concentration Sensor
CONDITION Used
BRAND Paccar
PART NUMBER Q21-6127-001
OTHER OEM PART NUMBERS THAT WILL WORK Q216127001, Q21-6170-001, Q216170001, Q21-6170-001K1T, Q216170001K1T, Q21 6170 001K1T, Q216167001, Q216167001K1T, Q21 6167 001K1T, Q21-6167-001, Q216127001K1T, Q21 6127 001K1T, Q21-6167-001K1T, Q216127001 Q21-6170-001K1T, Q216167001 | Q216127001, Q216170001 | Q216167001

Function of this part

The aftertreatment system treats exhaust gases after they leave the engine using components such as the DOC, DPF, and SCR catalyst. It controls soot and NOx emissions by trapping particulates and converting harmful gases into less harmful compounds.

Why this part matters

These components are central to emissions compliance on modern diesel trucks. Problems in the aftertreatment system can cause frequent regens, power derates, and down-time until the fault is corrected.

About the brand

PACCAR components support both Kenworth and Peterbilt trucks with OEM-grade fit and performance.

Fitment & usage

Used OEM parts are a smart choice for controlling repair costs while still using original-equipment components. Always match the OEM part number(s) listed to your existing part, and consult your service manual, dealer, or technician if you are unsure about fitment.

Note: Because this is a used component, normal signs of wear such as scratches, discoloration, or light surface corrosion may be present. Refer to the product photos and information on Second Truck Parts for the best representation of the part you will receive.

Shipping Notes
  • Free Standard Shipping on $100+ Orders to the USA.
  • Except Preorder products are shipped in 48 hours.
  • Delivery to the USA:
  1. Standard Shipping : 3-10 business days
  • If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
  • We offer a 30-day return/exchange service after receiving.
  • Final sale items are not eligible for returns or exchanges.
  • To process your return/exchange, please contact us at [email protected]
  • Please click here for more details>>> Return & Exchange Policy
SKU: 65969212760

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4.8 ★★★★★
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J
Verified Purchase
Jason G
Los Angeles, US
★★★★★ 1
Do not buy
Color: Green/Black
Do not buy. When I received the watch it did not work and the battery was dead. I bought a new battery and it killed that one as well after about a month.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on March 18, 2026
M
Verified Purchase
Miles Connell
Waukegan, US
★★★★★ 5
Inexpensive doesn’t mean cheap.
Color: Black/Orange
After 10 months, zero complaints. Well, I got rid of the horrible NATO strap 🙄. That’s a personal preference. Easy to swap out to whatever you like. Keeps accurate time meaning it’s the same time. I’m not micro analyzing it and the seconds gained/lost. It has a confident look and feel and makes you feel good when wearing it. Sure it’s not high priced but it’s not cheap. Very comfortable, light and not unincumbered. If this is what you’re looking at, you’d be satisfied. Great looking, durable and simple watch. Full confidence.
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Reviewed in the United States on October 25, 2025
B
Verified Purchase
Buyer
Fort Morgan, US
★★★★★ 3
Budget Seiko Prospex this is not
Color: Black/Orange
Bought this as a cheap work watch, but I guess all the budget went into the solar technology. No date adjust feature, gotta crank the crown over and over to adjust the date. (Also no screw-down crown, but that's expected at this price) Fake diver bezel. Lol why? Cringe as heck. Should of just put a compass bezel on there instead tbh. Cheap plastic crystal, scratches and mars just by looking at it. Okay NATO strap. Falls apart quickly, but it's easily replaceable with a better quality one. Decent lume on the hands, but none on the hour markers even though it looks like there is. Looks cool.
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Reviewed in the United States on June 13, 2025
M
Verified Purchase
Michael Miracle
Port Orchard, US
★★★★★ 5
Simplicity
Color: Black/Orange
This watch was received exactly as advertised. First off the watch is economical compared to other watches that advertise the same details. I will say that I have gone through numerous Luminox watches only to be disappointed. This watch fits the bill. It does have solar cells which mean it needs to be exposed to light to keep running, not a problem. Three minutes under my surefire light I am golden. The bezel doesn't rotate actually no big deal for me. I have always required that the bezel moves not anymore after having a bezel that rotates I use it next to never. Here's why, the more I rotate the bezel the more the numbers wear off. The strap on the watch with the catches for the strap are perfect. They actually hold the watch strap in place in lieu of like other big name brands that just flop and slide. As far as everyday use goes this watch is my go to. To be honest I have purchased three. This is the only watch I will wear moving forward, yeah the glass my scratch but even the big names like the Luminox I spoke of earlier scratches too.
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Reviewed in the United States on April 4, 2026
J
Verified Purchase
Jahn
Massapequa, US
★★★★★ 5
Excellent product, super good quality
Color: White, Size: Large
I think this is one of the best products I’ve bought on Amazon in recent years. I recommend it 100%; the fabric has a soft, comfortable texture, unlike other Oxford fabrics, which tend to be thicker and stiffer. It is easy—very easy—to iron, and the sizing is spot-on; I wear a size L, and it fit me perfectly. I will definitely be buying this shirt in black and navy blue.
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Reviewed in the United States on May 17, 2026

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