4Pcs O2 Oxygen Sensor for BMW 323i 325i X3 X5 E39 E46 Z3 Z4 Upstream DownstreamSPECIFICATIONS We stock oxygen sensors for most car models in the world with reasonable prices. If you can't find the parts you need in our listings, you can contact our customer service. Remember to provide your plate number or VIN number when placing your order. Type: Heating Type Sensor Type: Piezoelectric Sensitivity: As shown Resolution: 0258003477 Repeatability: As shown Origin: Mainland China OEM NO.: 1781433050,11781433075,11781433940