索纳塔氧传感器 39210-23750，实时稳定发动机燃烧，动力输出更平顺。

When Sonata experiences idle instability, rising fuel consumption, accelerating sluggishness, or MIL flickers, it usually indicates the oxygen sensor has aged and degraded, unable to monitor oxygen content accurately. Proper operation includes real-time feedback to ECU to maintain optimal combustion efficiency and stable power output with compliant emissions. OEM number 39210-23750; fits Hyundai Sonata various models (e.g., 2011–2014 2.0L/2.4L). Install only on a cold engine; use a special socket to avoid thread damage; clean exhaust interface and apply a small amount of anti-seize to prevent galling at high temperatures.