Diesel Exhaust Fluid (DEF) is an essential non-toxic solution comprised of urea and deionized water, specifically formulated to help modern Sprinter vans comply with stringent emissions standards. This fluid plays a critical role in reducing harmful nitrogen oxide (NOx) emissions produced during the combustion process by converting them into harmless nitrogen and water within the Selective Catalytic Reduction (SCR) system.
When the DEF tank reaches a low level, a warning indicator will illuminate on the dashboard, signaling that it's time to replenish the fluid. If the DEF is not refilled in a timely manner, the vehicle may enter a protective limp mode, limiting performance, or may even prevent starting altogether to safeguard the engine.
To refill the DEF tank, begin by locating the distinct blue "DEF only" cap situated conveniently under the hood. Use a dedicated dispensing nozzle or funnel designed for DEF to ensure a clean and efficient refill process. Once filled, make sure to securely fasten the cap to maintain the integrity of the system and prevent contamination. Regularly checking and maintaining the DEF level is crucial for optimal vehicle performance and compliance with emissions regulations.
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