In this Tech Tip Short, Erik Screeden breaks down the critical role of diesel aftertreatment sensors in keeping today’s engines clean, efficient and compliant. While DOC, DPF and SCR systems often get the spotlight, the real heroes behind consistent performance are EGT and NOx sensors—the components that ensure the system runs within precise diesel exhaust temperature monitoring thresholds.
Screeden explains how faulty or aging sensors can lead to inaccurate readings, excessive DEF usage, ammonia slip and even costly filter damage. For technicians, the takeaway is clear: During every DPF and SCR maintenance service, inspect and test sensors proactively. Replacing sluggish or degraded components not only restores emissions accuracy but also prevents unnecessary downtime and repeat visits, which boost shop efficiency and customer trust.
Watch this Tech Tip Short to see why smart sensor maintenance is the key to long-term diesel performance and profitability.Then visitWalker Products for more information.
Erik Screeden is the Technical and Multimedia Content Director for the Vehicle Service & Repair Group. He has been in the automotive industry for over 25 years. During that time, Screeden was a technician. He started out at a Ford dealership and continued to several independent repair facilities as well as spent time in the specialty aftermarket where he had the opportunity to work at a GM-specific performance shop. After his time as a technician came to an end, Screeden transitioned into a role providing scan diagnostic and J2534 tool support. He was then able to parlay his experience as a technician and a support specialist and use that in several technical sales roles.
