Kia Optima Rear Oxygen Sensor 39210-2G730 Exhaust Monitoring Replacement Part

Kia K8 rear oxygen sensor (OEM 39210-2G730) designed for exhaust after-treatment; installed behind the catalytic converter; continuously monitors oxygen content and feeds ECU to precisely adjust air-fuel ratio; ensures combustion efficiency and emissions compliance. Fits multiple K-series vehicles; use a dedicated socket; labor 0.5-1 hour. If fuel economy is abnormal, acceleration is weak, MIL lights up, or exhaust emissions are high, sensor signal may be faulty and replacement is required.