What is SPN 520371 & How to Solve It?

What is SPN 520371

SPN 520371: Refers to a fault related to the exhaust gas temperature (EGT) sensor, which measures the temperature of gases in the exhaust system.

When SPN 520371 is triggered, it indicates that the ECM is receiving abnormal or incorrect data from the EGT sensor, which could affect exhaust emissions control and engine performance.

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Why It Happened

This fault code is typically caused by:

• A malfunctioning EGT sensor.
  
• Wiring issues or poor connections between the sensor and ECM.
  
• Contamination or corrosion in the sensor or connectors.
  
• An exhaust system component failure affecting the sensor’s readings.
  
  

How to Resolve It

To resolve SPN 520371:

1. Inspect the EGT sensor for damage or wear, and replace if necessary.
   
2. Check the wiring and connections for any signs of damage, corrosion, or loose connections.
   
3. Inspect the exhaust system for any blockages or components affecting the sensor’s performance.
   
4. Clear the fault code and restart the engine to confirm the fix.
   
   

How to Avoid Before It Happens

To prevent SPN 520371:

• Regularly inspect the exhaust system, including sensors and wiring.
  
• Keep the exhaust system free from blockages and contamination.
  
• Use Clue to monitor exhaust temperature data and get early alerts on irregular readings.