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OEM Price: USD 1,011

USD 336

Save: $675

Roadwarrior Part #


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Direct Fit Replacement NOx Sensor for Paccar

OEM Price: USD 1,011

USD 336

Save: $675

Free ground shipping
Brand new! No core charge
OEM direct fit
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Need to Replace Your Paccar NOx Sensor (2236409)?

You’re driving along and your check engine light comes on, so you pull over to scan for fault codes. The DTC scan tool tells you there’s a problem with your 2236409 Paccar inlet NOx sensor. Your mechanic tells you the problem can’t be fixed, and you need a new sensor. What do you do next? If you don’t want to fork out for a new OEM sensor, and don’t want to risk an unknown aftermarket supplier, why not ask your dealer about Roadwarrior? Our NOX-PXX-010 is an exact-fit replacement for 2236409 — the Paccar MX-13 NOx sensor! Our 12-volt replacement sensor is suitable for Paccar engines from 2013 to the present!


What Does a NOx Sensor Do?

A nitrogen oxide sensor measures NOx levels in your semitruck’s exhaust gas and reports back to the ECU. The ECU uses these readings to make sure the SCR is working properly. Most semitrucks have two sensors—an inlet NOx sensor before the SCR and an outlet NOx sensor after the SCR. The inlet sensor tells the ECU how much DEF to inject into the pre-SCR exhaust, and the outlet NOx sensor measures NOx levels in the post-SCR exhaust to measure its performance. This helps your aftertreatment system make your semitruck’s emissions cleaner and less toxic!


Why Choose Roadwarrior Replacement NOx Sensors?

There’s a feeling in the OTR trucking community that aftermarket nitrogen oxide sensors are a gamble, and we understand this. With such varied quality between different aftermarket suppliers, it can be hard to know which ones to trust! So why is Roadwarrior different?


For one thing, we’re not a faceless online supplier shipping parts from unknown locations and preventing you from returning them if you have an issue! We’re a North American company with 13 warehouses in Canada and the U.S.A. that you can order from or visit personally to collect parts from! You can order Roadwarrior parts like NOX-PXX-010 through your dealer, and we can ship them to your site! Our most popular parts are also kept permanently in stock and are available for next day delivery!


We understand that being able to easily return faulty parts is important to our customers, and this is a big part of how we build trust in the OTR community. Although we rarely have parts returned, we have an industry-leading record for honoring warranties on faulty parts that are returned! With our hassle-free warranty and durable serial numbers on all our parts, we can replace any faulty parts and get you back on the road in no time!


Don’t Limp on With a Temporary Aftermarket Part!

We don’t believe in supplying cheap aftermarket NOx sensors that break down within a month—our replacement parts are built to last! As a sister company of DCL International Inc, we come from a tradition of quality and won’t put our branding on sub-par products. We benefit from DCL’s industry-leading emissions research and superior aftertreatment materials, and our customers enjoy the results! Our replacement Paccar sensor meets or exceeds OEM standards but with an aftermarket price tag, giving our customers the best of both worlds! You can order NOX-PXX-010, an exact-fit replacement for your Paccar MX-13 inlet NOx sensor 2236409, through your dealer or on this page. You can also order parts direct through our sales team on 1-8778979759! To find out more about how to tell quality aftermarket NOx sensors from unreliable ones, check out our blog.


What Problems Can My Paccar NOx Sensor (2236409) Experience?

Nitrogen oxide sensors have to be highly sensitive to pick up on fluctuations in NOx levels, but the result is that they are quite delicate. They often fail after about 300,000–400,000 miles because of soot build-up from the aftertreatment system. They can also become contaminated by moisture during installation, or due to internal leaks! For this reason, it’s worth being extra-careful if you’re installing replacement nitrogen oxide sensors yourself! If your 2236409 Paccar MX-13 NOx sensor becomes smothered with soot, it will likely mean a DTC, a check engine light on your dashboard and a trip to the mechanic for a replacement!


Here are the most common DTCs affecting the 2236409 Paccar inlet NOx sensor*

* (…) replaces the words ‘NOx sensor before catalyst’

P170C = NOx sensor before catalyst response – Data erratic, intermittent, or incorrect during overrun

P170D = NOx sensor before catalyst response – Incorrect

P170E = (…) response – Incorrect

P170F = NOx before catalyst – Data valid but too high during overrun

P1710 = NOx before catalyst – Data valid but too low

P1711 = NOx before catalyst – Data valid but too high

P30B3 = CAN communication – Message (AT1IG1) rate too low from NOx sensor before catalyst

P3863 = (…) power supply – Incorrect

P3864 = (…) – Short circuit or open circuit

P3865 = (…) – Short circuit or open circuit

P3866 = CAN communication – Message (AT1IGC1) timeout from NOx sensor before catalyst

P3867 = Heater element NOx sensor before catalyst performance – Malfunction

P3868 = Heater element NOx sensor before catalyst – Warm-up failed

P3869 = (…) – Short circuit or open circuit

P3870 = (…) – Power supply not correct

P3871 = CAN communication – Message (AT1IGC1) timeout from NOx sensor before catalyst

P3873 = CAN communication – Message (AT1IGC1) timeout from NOx sensor before catalyst

P3877 = (…) – Persist, not valid

P3881 = (…) power supply – Incorrect


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Better Coating, Better Performance.

Roadwarrior is the only manufacturer to use Metalcor® catalyst technology across its entire range of Diesel Oxidation Catalysts (DOCs) and Selective Catalytic Reduction catalysts (SCRs). Metalcor® catalysts feature high activity catalyst coatings fused to thinner, stronger, catalyst substrates to guarantee maximum performance under the harshest conditions.

Metalcor® catalyst coatings are designed and produced in our own labs. We then inspect each unit to ensure you get more fuel efficiency, lower consumption of DEF, and long term performance from your heavy duty engine!


Roadwarrior Has You Covered!

All Roadwarrior emissions parts carry a full value 12 month warranty.

LightningVolt lithium batteries carry a full value 30 month warranty.

To make the process hassle-free, our parts have a metal nameplate with the serial number, so even after 500,000 miles of service, it’s still easy to identify. This avoids the common problem of serial numbers printed on stickers that burn off after the first start-up, making them impossible to return. Our failsafe system allows us to work in your interests, honouring claims for on-road and off-road replacements, and giving you peace of mind.

And since Roadwarrior parts are designed to meet or exceed OEM specifications, you can rest easy knowing our direct fit parts will take the problems out of your aftertreatment without interfering with your OEM warranty.

Next Day Is Nice, Same Day is Better!​

A faulty emissions control system can cost you thousands in wasted man-hours as your heavy equipment sits in the shop awaiting a new part. Whether it’s a truck behind on orders, a bus that can’t take passengers, or heavy machinery delaying construction deadlines, Roadwarrior can get you moving again! 

Roadwarrior has twelve warehouses across the U.S.A. and Canada, which can deliver the most popular aftertreatment parts in 1-2 days. With over 1,000 DPFs, DOCs and SCRs on offer, Roadwarrior offers the largest aftertreatment catalogue.

*LightningVolt lithium batteries ship directly from Roadwarrior in Ontario, to ALL 50 states, including Alaska and Hawaii within 2-4 days.