What is MID 139 & How to Solve It?

What is MID 139:

MID 139 refers to a problem with the Fuel Temperature Sensor. The ECM detects an abnormal signal from the sensor, which can affect fuel system management and potentially cause engine performance issues, such as poor acceleration or fuel economy.

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Why This Happens:

• Faulty fuel temperature sensor.
  
• Shorted or damaged wiring in the sensor circuit.
  
• Loose or corroded sensor connectors.
  
• Incorrect power supply to the sensor.
  
• ECM failure to process the sensor’s data correctly.
  
  

How to Fix It:

1. Inspect the fuel temperature sensor for visible damage or malfunction.
   
2. Test the sensor’s voltage and resistance to ensure it is functioning properly.
   
3. Check wiring and connectors for visible damage or corrosion.
   
4. Replace the faulty sensor if necessary.
   
5. Ensure stable voltage supply to the sensor and ECM.
   
   

How to Avoid It Before It Happens:

• Regularly inspect the fuel temperature sensor and wiring.
  
• Keep connectors clean and free from corrosion.
  
• Ensure stable voltage supply to the sensor.
  
• Perform routine diagnostic checks to monitor sensor performance.
  
• Clue’s Fuel Management services provide real-time monitoring of fuel temperature to prevent sensor issues before they affect engine operation.