09款索纳塔领翔2.0L/2.4L 前氧传感器 39210-25130

2009 Sonata YF 2.0L/2.4L front oxygen sensor 39210-25130, installed at the front end of the exhaust pipe before the catalytic converter. Monitors oxygen content in exhaust and feeds signal to the ECU to precisely adjust the air-fuel ratio, ensuring combustion efficiency and emission compliance. OEM number 39210-25130, fits Sonata YF 2.0L/2.4L engines. Installation difficulty: medium. About 0.5-1 hour; requires special socket for removal. If idle unstable, fuel consumption rises, acceleration weak, or engine fault light on, inspect and replace.