Mercedes-Benz R129 Oxygen Sensor 0258003640 A0005407517 Direct Replacement for Original Position

Mercedes R129 series exhaust system maintenance, available with OEM 0258003640 (compatible with A0005407517) oxygen sensor. This part mounts directly in the exhaust pipe; monitors exhaust oxygen content in real time and feeds back to the ECU to ensure efficient combustion and compliant emissions. If the vehicle experiences rough idle, obvious fuel economy decrease, sluggish acceleration, or instrument cluster warning lights, it is likely due to aging or failure of the oxygen sensor. Installation difficulty is medium; labor about 0.5-1 hour; avoid thread damage; timely replacement restores performance.