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Trucks leaving a warehouse to illustrate the affects of an aftermarket NOx sensor
Posted in: Blog

What to Look for in an Aftermarket NOx Sensor?

To accurately measure NOx levels in your exhaust, NOx sensors have to be extremely sensitive. Unfortunately, this means they’re also quite delicate. The average NOx sensor should last for 50,000–60,000 miles, but many of them fail long before this! Most malfunctions are caused by soot build-up, but NOx sensors can also be contaminated by moisture during installation or from internal leaks.

Most long-haul drivers will need to replace at least one set of NOx sensors in their truck’s working life and this can be pricy. This creates a conundrum: fork out for an expensive OEM replacement or look for a cheaper aftermarket alternative! With the recent NOx sensor shortage, many OTR drivers that usually stick to OEM sensors have tried aftermarket parts instead. With this checklist, drivers can make sure they choose quality replacements from reliable aftermarket suppliers.

1. Get Your Replacement NOx Sensor from a Reliable Source!

Every OTR driver has heard the horror stories! NOx sensors from dodgy eBay sellers that never arrive, new parts failing within a week, impossible-to-reach customer service departments… These stories are a big part of why many drivers stick to OEMs instead of trying cheaper aftermarket suppliers. However, the recent NOx sensor shortage has led many OTR drivers to try aftermarket parts for the first time. For the most part, drivers who chose reputable suppliers have been pleasantly surprised. However, not all aftermarket manufacturers are of the same quality, so it’s important to choose one with a good reputation.

2. Choose a Specialist!

The aftertreatment system is very interconnected, so NOx sensors must be compatible with the whole system and the engine. However, because of this, NOx sensor issues are often the result of leaks and blockages from other parts. To produce a high-quality NOx sensor, manufacturers have to understand the common problems and malfunctions experienced by the whole system! NOx sensors from manufacturers with proven aftertreatment expertise generally last longer and are much less likely to cause problems!

3. Make Sure it’s Compatible with Your Semitruck!

A reputable manufacturer will thoroughly test their NOx sensors for unexpected malfunctions or complications. Before investing in a replacement, make sure it’s been tested for functionality and compatibility with your engine type! A NOx sensor that connects properly to your engine and aftertreatment system should ensure accurate readings. However, even reliable manufacturers sometimes produce a faulty part, so the next thing to look out for is the warranty!

Image of a red truck

4. Choose a NOx Sensor with a Good Warranty!

Before you buy an aftermarket NOx sensor, check what kind of warranty it has. This includes finding out whether the manufacturer is known for honoring warranties and how quickly they usually replace faulty parts. Establish whether they have an easy-to-reach customer service team in case there’s a problem with your part. Consider whether you’ve used their aftermarket parts before. If you still aren’t sure, look at their reviews and ask about them through your dealer or on OTR driver forums! This way you can enjoy the benefits of aftermarket parts and trust that you’ve chosen a reliable supplier!

The next thing to find out is how the company marks their parts! If a NOx sensor’s serial number is only identified by a sticker, it could burn off during the first use, giving companies grounds to deny your warranty. A reputable company will mark their parts with durable serial numbers that withstand heavy use during the warranty period and beyond. By making it easy to return any faulty parts, aftermarket companies show that they trust their parts to perform as promised.

5. Have it Professionally Installed! 

One of the leading causes of NOx sensor failure is moisture contamination during installation. With this in mind, we recommend going to a professional mechanic rather than trying to install a NOx sensor yourself! If you install a faulty one yourself, it’s harder to prove that the fault occurred during manufacture not installation. A professional mechanic can check for issues and install the part with much less risk of damaging or contaminating it! It’s also worth discovering if the aftermarket manufacturer you’re buying from sells to dealers, or just to individuals. Even better, find out if your dealer has ordered parts from them before, and if they’d recommend the supplier!

Image of a blue truck reflected in a puddle, to illustrate the benefits of the Roadwarrior NOx sensor offering.

Why Should You Come to Roadwarrior for Aftermarket NOx Sensors?

We know that a lot of OTR drivers are wary of aftermarket NOx sensors because of how delicate and easily damaged they are. With that in mind, we don’t expect you to just trust that ours are a safe bet. Here are the top 5 reasons why you should give them a go:

  1. We have the largest aftermarket catalogue of aftertreatment parts in the semitruck industry. We’ve built up this catalogue one product at a time by really understanding the whole system and how each part impacts the rest.
  2. Our parts aren’t cheap stand-ins for OEM replacements—they offer OEM-equivalent or better performance! We test our NOx sensors both for compatibility with OEM engines, and to make sure they provide the most accurate, reliable readings.
  3. You can order NOx sensors through our site, or through your dealer, and we will happily ship them direct to your dealer!
  4. We rarely have parts returned, but when a faulty part is sent back, our record for honoring warranties is the best in the industry. This is partly because we stencil on our serial numbers, so our parts are easy to identify and return. With 12 distribution centers across North America and an approachable customer service team, it’s a quick and easy process to get you a replacement NOx sensor if something goes wrong.
  5. We’ve worked really hard to build our reputation as a reliable aftermarket supplier with good-quality products. We’ve done this by using only the best materials, thoroughly researching and testing each new product, and offering our customers complete transparency. We won’t put our brand name on something unless we’re sure that it’s reliable and good quality, and if you receive a faulty part, you can be assured that we’ll replace it and get you back on the road in the shortest time possible!

Find heavy-duty truck NOx sensors?

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.