P0038

Symptoms

• Check Engine Light Illuminates
• Increased fuel consumption
• Unstable engine idling
• Deterioration of dynamic characteristics
• Black smoke from the exhaust pipe
• The smell of unburnt fuel in the exhaust gases

Causes

• Short circuit in oxygen sensor heater wiring
• Open or damaged ground circuit
• O2 sensor heating element malfunction
• Damage to the oxygen sensor connector
• Engine control module (ECM) malfunction
• Corrosion of contacts in connectors
• Damage to wiring due to exposure to high temperatures

How to Fix

1. Connect a diagnostic scanner and read all error codes
2. Check the voltage and resistance of the O2 sensor heater circuit
3. Inspect wiring and connectors for damage
4. Measure the resistance of the heating element (should be 2-14 Ohms)
5. Check the oxygen sensor ground circuit
6. If necessary, replace damaged wiring or connectors
7. Replace the oxygen sensor if it is faulty
8. Clear error codes and test drive
9. Re-check the system with a scanner to confirm that the problem has been resolved.

Related codes

Error P0038 by Vehicle Brand