Hyundai Sonata 8th Generation Rear Oxygen Sensor 39210-2G550 Direct Replacement

Hyundai Sonata 8th gen rear oxygen sensor 39210-2G550 uses an original-position design; no rewiring or brackets required; directly replace original sensor. Monitors post-cat oxygen content and sends signal to ECU to adjust fueling and air-fuel ratio for efficiency; fits 2011–2014 2.0L and 2.4L models. When check engine light is on, fuel economy drops, acceleration lags, or idle unstable, replacement often resolves; symptoms also include black smoke from exhaust and strong odor.