Need to Replace a Cummins NOx Sensor 4326873, 4326874 or 4326872?
Roadwarrior’s NOX-CXX-003 is a plug-and play replacement for Cummins outlet NOx sensors with part numbers 4326874 or 4326872! It’s also a perfect-fit replacement for your Cummins inlet sensor 4326873. The Roadwarrior aftermarket catalogue includes high-performance equivalents for 8 Cummins NOx sensor models! Our NOx sensors are rigorously tested before being released to ensure they’re compatible with Cummins ISX engines! Our testing also ensures that our parts meet the reliability and performance standards of the inlet or outlet Cummins NOx sensor they’re replacing! Find our full range of Cummins NOx sensor replacements here.
What is a NOx Sensor?
Most Cummins engines have two NOx sensors, one on either side of the SCR, to measure NOx in the exhaust! The inlet/ upstream sensor monitors NOx levels before the SCR, so the ECU knows how much DEF to inject. The outlet/ downstream NOx sensor then checks the NOx levels post-SCR. The ECU uses this combined data to make sure the SCR is working and establish whether it needs more DEF. This helps the SCR reduce toxic nitrogen oxide particles in your exhaust!
Why Choose Roadwarrior NOx Sensors?
Many drivers hesitate before trying aftermarket Cummins NOx sensors. This can be because of their own experiences or unflattering stories they’ve heard from other OTR drivers. The aftermarket experience varies a lot between suppliers, so we can understand this approach! That’s why we believe it’s so important to show our customers that they can trust us. Roadwarrior parts give drivers the lower prices and shorter delivery times of an aftermarket part, with the accountability of an OEM. You can order a Roadwarrior replacement for your inlet or outlet Cummins NOx sensor (4326873, 4326874 or 4326872) from your local dealer. You can also order, or browse our other Cummins NOx sensor replacements, on our website!
As a Canadian company with 13 warehouses across North America, we’re easy to contact! We keep our most ordered parts always in stock, so a Roadwarrior part means less downtime. Many of our most popular parts even come with next-day delivery or same-day pick-up! If you’d like to talk to a Roadwarrior representative, you can order parts straight through our sales team on 1-877-897-9759! If you’d rather start by learning what to look for in an aftermarket replacement for a Cummins NOx sensor, we recommend reading our blog.
What Are the Most Common Cummins NOx Sensor Problems?
Cummins NOx sensors are an extremely sensitive part that measures fluctuations in microscopic NOx particles in your exhaust stream. However, as with all delicate sensors, a small amount of damage or contamination can cause NOx sensors to malfunction. A benefit of a highly interconnected combustion and aftertreatment system is that the ECU can pick up data inconsistencies between parts and trigger a DTC. The downside is that soot contamination from other emissions-related parts is a leading cause of Cummins NOx sensor problems. If soot from the exhaust clogs up the nitrogen oxide sensor, it can also give inaccurate readings! This can then cause too much or too little DEF to be injected before the SCR.
Your 4326873, 4326874 or 4326872 Cummins NOx sensor is also highly susceptible to moisture contamination! The sensor can be exposed to moisture during installation or through your semitruck’s exhaust. The risk of contamination is one reason we recommend having your NOx sensor professionally installed, rather than installing it yourself. If you have any issues, this also makes it easier to prove that the part was faulty and didn’t become contaminated during installation.
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