30751797 Oxygen Sensor / Air-Fuel Ratio Sensor for Volvo S40, C30, C70

The Volvo 30751797 is a heated front oxygen sensor (upstream oxygen sensor) designed specifically for Volvo 5-cylinder non-turbocharged engines. It ensures that models such as the C30, S40, and V50—typically equipped with 2.4L or similar engines—achieve optimal emissions standards and fuel economy. As a direct-fit replacement part, its primary function is to monitor the vehicle’s exhaust emissions.