Sonata Lingxiang Rear Oxygen Sensor 39210-2G400 Stable Output

When your Hyundai Sonata Yundong/Elantra/XG Daniel (Sonata Yundong) shows check engine light on, fuel consumption rising, exhaust odor increasing, or rough idle, it usually indicates the rear oxygen sensor is aging or failed and cannot accurately monitor exhaust oxygen content. When functioning, it feeds the ECU with oxygen concentration signals to precisely control the air–fuel ratio, ensuring combustion efficiency and emission compliance. OEM number 39210-2G400, fit Hyundai Sonata Yundong models. Use a dedicated socket to remove to avoid damaging threads; ensure sensor wires do not contact the exhaust to prevent heat damage.