This upstream (air/fuel ratio) oxygen sensor works on the Prius V. But it's not designed for the Prius, as it will trigger a check-engine light on the Prius within 24 hours of use (sensor biased stuck in rich mixture).Perfect fit on the B2S2 position for my 2010 Lexus RX350. Althought the cable is longer than the OEM, the conector fit just perfect and cleared the code P0157Arrived in timely fashion and was exactly what was needed!!Replacement was Exact fit in engine exhaust. Cleared up O2 sensor issueDenso 234-4400 O2 Oxygen Sensor AF Air Fuel Ratio Sensor was purchasedO2S2=Sensor2 the one after the Catalytic converterSprayed penetratingly fluid on the old part a few days before.Unplugged electrical connectorUsed O2 sensor short socket to remove from a 2012 PriusThis sensor cured the message " no voltage-" O2S2Improved mileage 1.4 MPGEasy repair