Diesel Isn’t What It Used to Be — What I Learned at DMS1–4

Most people don’t realise just how complex today’s diesel engines have become — especially when it comes to emissions systems. Over the past two days, I’ve stepped out of the workshop and into a classroom, diving into AECS’s DMS1–4 training: a deep exploration into the chemistry, physics, and engineering behind modern diesel exhaust treatment. Think you just need to “blast the DPF out” or replace a sensor? That might be masking the real problem. This course broke down what’s really happening inside systems like SCR (Selective Catalytic Reduction), DPF (Diesel Particulate Filter), and EGR (Exhaust Gas Recirculation). It’s not about throwing parts at a fault code. It’s about understanding why the system failed, what affects it upstream, and how to test it properly — before wasting your time or money.

✅ Coming in Part 2:

• Common causes of premature DPF failure

• Why your diesel might look fine and still fail emissions

• How Agnews is updating our diagnostic process

• Tips for diesel owners to prevent costly repairs

Stay tuned — or drop us a message if your diesel is showing warning lights, running rough, or losing power. We’re here to sort it out properly.