9th Generation Sonata 2015 Model Oxygen Sensor 39210-2G105, plug and play.

The ninth-generation Hyundai Sonata (2015) oxygen sensor, OEM 39210-2G105, is plug-and-play with no extra programming. It installs on the exhaust pipe, directly monitors oxygen content, and feeds back to the ECU to precisely control the air–fuel ratio for engine efficiency and emissions compliance. Installation difficulty moderate; typical service time 30–45 minutes; avoid damaging threads during removal. If idle is unstable, fuel consumption rises suddenly, acceleration is weak, or the engine warning light is on, the sensor is likely aging.