What is CID 1042 & How to Solve It?

What is CID 1042:

CID 1042 refers to a problem with the vehicle’s exhaust gas temperature (EGT) sensor. The ECM detects that the sensor is providing inaccurate or out-of-range readings, which can affect exhaust after-treatment performance and emission control.

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Why This Happens:

• Faulty exhaust gas temperature sensor.
  
• Shorted or damaged wiring in the sensor circuit.
  
• Corroded or loose connectors.
  
• Malfunctioning exhaust after-treatment system.
  
• ECM misinterpreting sensor signals.
  
  

How to Fix It:

1. Inspect the exhaust gas temperature sensor for visible damage.
   
2. Test the sensor’s voltage and resistance to confirm accuracy.
   
3. Check wiring and connectors for corrosion or loose contact.
   
4. Replace the faulty sensor if it fails diagnostic tests.
   
5. Verify the exhaust after-treatment system’s operation.
   
   

How to Avoid It Before It Happens:

• Regularly inspect and clean the exhaust sensors.
  
• Keep wiring protected from heat and corrosion.
  
• Conduct scheduled diagnostics on the exhaust after-treatment system.‍
• Clue’s equipment maintenance services can help track exhaust sensor health and prevent downtime.