2004 Santa Fe P0052 O2 Sensor Heater Control Circuit Fault - Bank 2, Sensor 1

Diagnostic Code P0052: Oxygen Sensor (HO2S) Heater Control Circuit Failure - Detected in Bank 2, Sensor 1 of a 2004 Santa Fe. This code indicates an issue with the heater circuit of the oxygen sensor located on the second bank of the engine, which is responsible for maintaining proper sensor temperature during cold starts to ensure accurate air-fuel ratio readings. The fault may be caused by a faulty wiring harness, poor connection at the sensor, or internal failure of the sensor itself. Common symptoms include reduced fuel efficiency, increased emissions, and possible check engine light activation. Recommended troubleshooting steps: inspect wiring and connectors for corrosion or damage, test the heater circuit voltage using an OBD2 scanner, and consider replacing the oxygen sensor if electrical continuity is compromised.