What is P0037 & How to Solve It?

What is P0037:

P0037 is a generic diagnostic trouble code (DTC) that indicates an issue with the Oxygen Sensor Heater Control Circuit Low (Bank 1, Sensor 2). This code means that the oxygen sensor heater circuit is receiving too low of a signal, which can prevent the sensor from reaching the proper operating temperature and can lead to poor engine performance and higher emissions.

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Why This Happens

The P0037 code can be caused by:

• Faulty oxygen sensor heater on Bank 1, Sensor 2.
  
• Damaged wiring or short circuits in the heater circuit.
  
• Faulty Engine Control Module (ECM) sending too low of a signal.
  
• Blown fuse for the oxygen sensor heater circuit.
  
• Corroded or loose connectors affecting the signal to the ECU.
  
  

How to Fix It

To resolve the P0037 code, follow these steps:

1. Inspect the wiring and connectors for any visible damage, corrosion, or loose connections.
   
2. Test the oxygen sensor heater for proper voltage and functionality.
   
3. Check the fuse for the oxygen sensor heater circuit and replace it if blown.
   
4. Test the oxygen sensor for proper functionality and replace it if necessary.
   
5. Clear the fault code and restart the engine to verify if the issue is resolved.
   
   

How to Avoid It Before It Happens

To prevent the P0037 fault code:

• Regularly inspect the oxygen sensor heater and wiring.
  
• Monitor oil levels to ensure proper sensor function.
• Perform routine diagnostics to catch potential issues early.