Mercedes-Benz W203 Oxygen Sensor 0258007161 A0035427318 Precise Air-Fuel Ratio Control

Mercedes-Benz models based on the W203 chassis (C-Class) and CLK with M271 engines: this oxygen sensor (OEM number 0258007161, corresponding to A0035427318) uses a high-temperature ceramic core and stainless steel housing to resist heat shocks and corrosion, offering OEM-level durability. It monitors exhaust oxygen content in real time and feeds signals to the ECU to maintain the ideal 14.7:1 air-fuel ratio, ensuring combustion efficiency and compliant emissions. Installation difficulty is moderate; use a dedicated socket to remove the old part and avoid thread damage to achieve precise air-fuel control.