Hi, This oxygen sensor is for after the catalytic converter (downstream). Depending on the vehicle application it can be used for either the passenger or driver side. To check for fitment, please enter your vehicle’s year, make, model, sub-model, and engine type, and type the part's name in the search box. Once your application is selected, you’ll see a “Guaranteed to Fit” badge if the part will fit, and we recommend that you also double-check Your Vehicle Fit Details as well as the Vehicle Fitment Information table on the product page.