What is SPN 520199 FMI 2 & How to Solve It?

What is SPN 520199 FMI 2

SPN 520199: Refers to a fault related to the exhaust gas recirculation (EGR) system, specifically indicating an issue with the EGR flow rate sensor.

FMI 2: Indicates that the data from the EGR flow rate sensor is below the expected range, meaning the ECM is receiving readings that suggest low EGR flow.

Together, SPN 520199 FMI 2 points to a problem with the EGR system’s flow rate sensor, which could affect engine emissions and performance.

Why It Happened

This fault is commonly caused by:

• A malfunctioning or blocked EGR flow rate sensor.
  
• Low EGR flow caused by a restricted EGR valve or cooler.
  
• Wiring issues or poor connections between the sensor and ECM.
  
• A failure in the EGR system itself.
  
  

How to Resolve It

To resolve SPN 520199 FMI 2:

1. Inspect the EGR flow rate sensor and replace it if faulty.
   
2. Check the EGR system for blockages or contamination.
   
3. Inspect the wiring and connections for damage.
   
4. After repairs, clear the fault code and restart the engine to verify the fix.
   
   

How to Avoid Before It Happens

To prevent SPN 520199 FMI 2:

• Regularly inspect and clean the EGR system, including the sensor and valve.
  
• Check for any blockages in the EGR flow path.
  
• Use Clue to monitor EGR system performance and get early alerts on low flow readings.
• Use preventive maintenance to keep assets running smoothly.