Observing the smoke color—black, white, or blue—can help quickly diagnose the problem. Modern diesel vehicles, particularly those built after 2007, feature Diesel Particulate Filters (DPF) and sometimes SCR/DEF systems to meet emissions standards. Understanding these systems and what smoke colors indicate is essential for engine health, emissions control, and avoiding costly repairs. What is a ... <a title="Diesel Engine Exhaust Smoke Explained: Black, White, and Blue Smoke Causes, DPF Function, and Solutions" class="read-more" href="https://zdfix.com/diesel-engine-exhaust-smoke-explained-black-white-and-blue-smoke-causes-dpf-function-and-solutions/" aria-label="Read more about Diesel Engine Exhaust Smoke Explained: Black, White, and Blue Smoke Causes, DPF Function, and Solutions">Read more</a>