Mercedes-Benz R129 Classic Replacement Oxygen Sensor A0005407517 0258003640 Blessing for Old Cars

Oxygen sensor directly replaces OEM number A0005407517 and also compatible with 0258003640; broad compatibility. Function: monitor exhaust oxygen content and feed ECU to adjust air-fuel ratio; suits older Mercedes-Benz R129 series vehicles; installation fixes high fuel consumption, weak acceleration, strong exhaust odor, and prevents engine light from turning on. If idle is unstable, exhaust is blackened, or fuel consumption rises by 1–2 units, sensor aging is likely; replace with this part.