Diesel Exhaust Fluid (DEF) is a solution used in modern diesel vehicles to reduce harmful emissions produced by the engine. It is a mixture of urea and deionized water that is injected into the exhaust stream to break down harmful nitrogen oxides (NOx) into harmless nitrogen and water vapor. DEF is stored in a separate tank in the vehicle and is automatically sprayed into the exhaust system when needed.
Technical Explanation:
Common Symptoms:
- Warning light on the dashboard indicating low DEF levels
- Reduced engine performance or power
- Increased emissions output
Diagnosing:
- Checking the DEF tank level to ensure it is not empty
- Inspecting the DEF system for leaks or malfunctions
- Using diagnostic tools to check for error codes related to the DEF system
Common Repairs:
- Refilling the DEF tank with the appropriate fluid
- Repairing any leaks in the DEF system
- Replacing faulty DEF injectors or sensors
- Updating software or recalibrating the DEF system to resolve any issues