雪佛兰凯迪拉克下游后氧传感器 12609457 / 213-4229，AIUSLN 跨境热销

When your Chevy or Cadillac shows check engine light, fuel consumption rise, acceleration weak, or exhaust odor pungent, it usually means downstream downstream oxygen sensor aged or failed; responsible for monitoring oxygen content downstream of catalyst and sending signal to ECU to optimize air-fuel ratio for efficient operation and reduced emissions. OEM 12609457, compatible with 234-4256, 213-4229, 2134229, 234-4407 etc.; fits Chevrolet Cruze, Malibu, Cadillac ATS, XTS and other models. Installation: ensure sensor threads clean and anti-seize applied; avoid cross-tightening; route wiring away from high-temperature exhaust.