What is CID 987 & How to Solve It?

What is CID 987:

cid 987 refers to a problem in the engine oil temperature sensor circuit. incorrect readings can cause the ecm to mismanage fuel timing or lubrication cycles.

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Why This Happens:

• faulty oil temperature sensor.
  
• open or shorted sensor wiring.
  
• low or contaminated oil.
  
• poor connection at the ecm.
  
• faulty sensor grounding.
  
  

How to Fix It:

1. inspect the oil temperature sensor for cracks or corrosion.
   
2. test resistance across the sensor terminals.
   
3. verify stable voltage at sensor connector.
   
4. replace the sensor if resistance is out of range.
   
5. refill with clean oil if contaminated.
   
   

How to Avoid It Before It Happens:

• perform regular oil changes with manufacturer-approved oil.
  
• check sensors and connectors for corrosion.
  
• run diagnostics on oil system sensors.
  
• clue’s equipment maintenance services monitor engine oil systems to prevent thermal stress and ensure reliability.