If your diesel exhaust fluid (DEF) light is on, you need to solve this issue as quickly as possible. Your selective catalytic reduction (SCR) system’s warning light helps you recognize and solve potential problems before major damage occurs. Here’s how these systems work and how to solve the problem. What Does the DEF Warning Light …

Diesel exhaust fluid (DEF) is essential to your selective catalytic reduction (SCR) system. This fluid converts nitrogen oxides into less harmful gases like nitrogen gas and water vapor, and consists of blended automotive-grade liquid urea (32.5%) and deionized water (67.5%). DEF crystal buildup is one of these systems’ most common — and costly — problems. …

Your diesel selective catalytic reduction (SCR) system is essential to maintaining your vehicle’s engine and managing emissions. Discover how to prevent diesel exhaust fluid (DEF) crystallization and keep your system clean and performing optimally, with a simple maintenance plan. What Is a Diesel SCR System? A diesel SCR system controls emissions by reducing the volume …