[Compatible with] The oxygen sensor kit is compatible with 2007 2008 2009 2010 Mini Cooper 1.6L L4 DOHC; 2009 2010 Mini Cooper 1.6L L4 SOHC. [Part Number] Upstream oxygen sensor: 234-5135, 2345135; Downstream oxygen sensor: 234-4488, 2344488. [Function] O2 oxygen sensors are an important component of fuel and exhaust systems, can measure unburned oxygen in the exhaust, effectively detect the oxygen content in the gas and send it to the engine computer, optimizing fuel economy. [Easy Installation] Based on data, fits. Upstream is 6-pin and downstream is 4-pin. Plug and play, direct installation without modification, time-saving and labor-saving. Material: ABS Color: black Package Contents: 2 x oxygen sensor Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.