Diesel Exhaust Fluid (DEF) System Recharge Procedure

Here's a step-by-step guide to properly recharging your vehicle's DEF system:

Standard DEF Fill Procedure

1. Locate DEF Tank:Usually found near the fuel tank or in the trunk area. The cap is typically blue and clearly marked "DEF" or with a urea symbol.
2. Vehicle Preparation:
   • Park on a level surface
   • Turn off the engine
   • Engage parking brake
3. Clean Fill Area:Wipe around the DEF cap to prevent contamination
4. Add DEF:
   • Remove DEF tank cap
   • Pour DEF carefully using a funnel if needed
   • Fill until the tank is full or reaching recommended level
   • Don't overfill - allow room for fluid expansion
5. Secure Cap:Replace and tighten the DEF cap properly

Professional Service Procedure

1. Diagnostic Check:
   • Connect diagnostic tool
   • Check for any system fault codes
   • Verify DEF quality and level sensors
2. System Inspection:
   • Check DEF lines for crystallization
   • Inspect DEF pump functionality
   • Verify injector operation
3. Quality Check:
   • Test DEF concentration
   • Ensure fluid meets ISO 22241 standards
4. System Reset:
   • Clear any fault codes
   • Reset DEF level monitoring system
   • Verify proper system operation

Important Notes:

• Use Only Pure DEF:Never add water or other fluids to DEF
• Storage:DEF should be stored between 12°F and 86°F
• Shelf Life:Typically 12-18 months in proper storage conditions
• Contamination:Even small amounts of contamination can damage the system

Warning:If your vehicle has entered reduced power mode due to low DEF, simply adding more DEF may not resolve the issue. Professional diagnostic service may be required.