What is CID 985 & How to Solve It?

What is CID 985:

cid 985 refers to a problem with the exhaust gas pressure sensor circuit. inaccurate readings can cause improper egr operation or trigger emission system errors.

‍

Why This Happens:

• faulty exhaust gas pressure sensor.
  
• soot buildup in exhaust passages.
  
• shorted or open circuit.
  
• corroded connectors.
  
• ecm data interpretation fault.
  
  

How to Fix It:

1. inspect and clean exhaust pressure lines.
   
2. test sensor voltage and pressure response.
   
3. clean connectors and inspect wiring insulation.
   
4. replace sensor if values remain unstable.
   
5. clear codes and verify correct pressure data.
   
   

How to Avoid It Before It Happens:

• keep exhaust systems clean during maintenance.
  
• avoid prolonged idling that promotes soot buildup.
  
• monitor pressure sensor readings regularly.
  
• clue’s construction fleet management software helps monitor exhaust systems for early warning signs of pressure faults.