BMW D2S Headlight Ballast 5DV007760-71 4B0941471 63128386708

Hyundai Sonata, Tucson, Kia Sorento, K5 universal oxygen sensor OEM 39210-2G100. Mounted on exhaust manifold or pipe, monitors exhaust oxygen content in real time and feeds ECU to control air-fuel ratio; ensures combustion efficiency and emissions compliance. Installation difficulty medium; 30-45 minutes suggested. If idle unstable, fuel consumption rises, acceleration weak, or check engine lamp on, sensor aging is likely; replace promptly.