What is P0035 & How to Solve It?

What is P0035:

P0035 is a generic diagnostic trouble code (DTC) that indicates an issue with the Oxygen Sensor Heater Control Circuit (Bank 1, Sensor 2). This code means that the engine control unit (ECU) is receiving a signal from the oxygen sensor heater circuit that is not within the expected range, which can result in poor engine performance and increased emissions.

Why This Happens

The P0035 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) failing to manage the heater circuit correctly.
  
• Blown fuse for the oxygen sensor heater circuit.
  
• Corroded or loose connectors affecting the heater circuit signal.
  
  

How to Fix It

To resolve the P0035 code, follow these steps:

1. Inspect the wiring and connectors for any visible damage, corrosion, or loose connections.
   
2. Test the oxygen sensor heater to ensure it is functioning correctly.
   
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 P0035 fault code:

• Regularly inspect the oxygen sensor heater and wiring.
  
• Ensure oil levels and maintain oil quality for proper sensor function.
  

Perform routine diagnostics to catch issues early before they escalate into more significant problems.