现代伊兰特速迈氧传感器 39210-2B070，高效传感升级，动力恢复明显。

When your Hyundai Elantra or Smae experiences check engine light, rough idle, weak acceleration, or noticeably increased fuel consumption, it is likely the oxygen sensor aged or failed, causing air-fuel imbalance. This sensor normally monitors exhaust oxygen content and sends signals to the ECU to precisely control injection, ensuring efficient combustion and smooth power output. OEM number 39210-2B070; fits Hyundai Elantra, Smae, and other multiple models. Note: perform installation after engine cools; disconnect battery negative before replacing; use a special sleeve to carefully unscrew the old sensor to avoid thread damage; applying a small amount of anti-seize compound on install is recommended, but avoid contact with the sensor tip.