What is MID 155 & How to Solve It?

What is MID 155:

MID 155 refers to an issue with the Exhaust Gas Recirculation (EGR) Valve. This fault occurs when the ECM detects that the EGR valve is malfunctioning, which can cause improper exhaust gas recirculation and result in reduced engine efficiency and increased emissions.

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Why This Happens:

• Faulty EGR valve.
  
• Shorted or damaged wiring in the EGR system circuit.
  
• Blockages or contamination in the exhaust system affecting EGR function.
  
• Loose or corroded connectors.
  
• ECM failure to process the EGR valve data properly.
  
  

How to Fix It:

1. Inspect the EGR valve for damage or malfunction.
   
2. Test the EGR valve control circuit for proper voltage.
   
3. Check wiring and connectors for visible damage or corrosion.
   
4. Replace the faulty EGR valve if necessary.
   
5. Inspect the exhaust system for blockages or contamination affecting EGR operation.
   
   

How to Avoid It Before It Happens:

• Regularly inspect the EGR valve and wiring.
  
• Keep the exhaust system clear of contaminants and blockages.
  
• Perform routine maintenance on the EGR system.
  
• Monitor EGR system performance using diagnostic tools.
  
• Clue’s Equipment Maintenance services track EGR valve health and prevent issues from affecting engine efficiency.