Having Trouble with Your Volvo Mack NOx Sensor?
We stock aftermarket replacements for Volvo Mack NOx sensors with part numbers 22303390, 22303384 and 22303391. We test our nitrogen oxide sensors for both OEM-quality performance and compatibility, so you can install our parts with confidence! Roadwarrior sensors work well with Mack MP7 and MP8 engines, and Volvo D11, D13 and D16 engines. We also stock aftermarket replacements for your Mack DPF, DOC and SCR, gaskets, DEF dosers, clamps, and even emissions combustion chambers!
Which Roadwarrior Part is Right for My Semitruck?
- The Roadwarrior part NOX-VXX-002 is an exact-fit replacement for your inlet Volvo Mack NOx sensor 22303390.
- The Roadwarrior outlet sensor NOX-VXX-008 is a plug-and-play replacement for your post-SCR Volvo Mack NOx sensor 22303384.
- The Roadwarrior outlet NOx sensor NOX-VXX-001 is a precise-fit substitute for a post-SCR Mack sensor 22303391.
What is a NOx Sensor?
Your Mack engine comes with two nitrogen oxide sensors. The inlet sensor monitors NOx levels in the exhaust before the SCR and the outlet sensor measures them after the SCR. Based on this information, the ECU determines how much DEF (urea) to inject into the pre-SCR exhaust stream. The gas reacts with the SCR catalyst, splitting the NOx into nitrogen and oxygen, making your semitruck’s emissions less toxic! NOx sensors also tell the ECU how well the SCR is working and alert it to any issues.
Why Are Roadwarrior NOx Sensors the Right Choice?
In the OTR trucking community, there’s a conception that buying an aftermarket nitrogen oxide sensor is a gamble! At Roadwarrior, we’ve made it our mission to prove that our aftermarket parts are a safe bet! By creating parts that provide consistent, reliable performance over time, we build trust among OTR drivers. So, when our customers need to replace a Mack MP8 NOx sensor, they see our parts as a permanent fix, not just a band aid! Our parts are built to last, not just to be a cheap stand-in till your new OEM part arrives, so every part comes with a hassle-free warranty! This way, if there’s an issue with your part, it’s quick and easy to return it and get it replaced!
With 13 warehouses spread across the U.S.A. and Canada, we’re able to offer next-day delivery on our most popular parts. You can order your replacement Volvo Mack NOx sensor (22303390, 22303384 or 22303391) through your dealer or on our website. If you prefer, you can also order parts straight through our sales team on 1-877-897-9759! To browse our other NOx sensors, check out our catalogue. Otherwise, why not head to our blog to learn what to look out for in a reliable aftermarket nitrogen oxide sensor.
What Problems do Volvo Mack NOx Sensors Have?
A fully functioning NOx sensor helps the ECU figure out how much fuel to inject into the combustion chamber and how much DEF to inject before the SCR. When the NOx sensor malfunctions, the SCR can’t do its job properly and this can lead to excess smoke coming out of the exhaust pipe. You may also see increased fuel consumption and either an increase or a decrease in DEF use depending on the exact issue. If your Mack MP8 NOx sensor is playing up, for example, the most likely causes are moisture contamination from a leak, or because it’s clogged with soot!
Soot contamination is more common in the inlet sensor (22303390) before the SCR, than in the outlet sensor (22303384 or 22303391) after the SCR. Moisture contamination on the other hand can affect either sensor, especially if it occurs during installation. For this reason, you should be especially careful when replacing your Mack NOx sensor.
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