Ruiya 4PCS Upstream + Downstream For 1998-2003 BMW X5, 750iL 4.4L 4.6l 5.4L O2 Oxygen Sensor

Description：
The oxygen sensor, located either upstream or downstream of the catalytic converter, is designed to monitor the air-fuel mixture under idle, moderate acceleration, and cruise conditions. Symptoms of a faulty or bad oxygen sensor include bad gas mileage, rough idle, reduced drivability, and an illuminated check-engine light.

Fitment：
2 Upsteam & 2 Downstream 2003 BMW X5 4.4i Formula 1 Sport Utility 4-Door 4.4L 4398CC V8 GAS DOHC Naturally Aspirated
2 Upsteam & 2 Downstream 2003 BMW X5 4.4i Lujo Sport Utility 4-Door 4.4L 4398CC V8 GAS DOHC Naturally Aspirated
2 Upsteam & 2 Downstream 2003 BMW X5 4.4i Sport Utility 4-Door 4.4L 4398CC V8 GAS DOHC Naturally Aspirated
2 Upsteam & 2 Downstream 2003 BMW X5 4.4i Top Line Sport Utility 4-Door 4.4L 4398CC V8 GAS DOHC Naturally Aspirated
2 Upsteam & 2 Downstream 2003 BMW X5 4.6is Sport Utility 4-Door 4.6L 4598CC V8 GAS DOHC Naturally Aspirated
2 Upsteam & 2 Downstream 2002 BMW X5 4.4i Lujo Sport Utility 4-Door 4.4L 4398CC V8 GAS DOHC Naturally Aspirated
2 Upsteam & 2 Downstream 2002 BMW X5 4.4i Sport Utility 4-Door 4.4L 4398CC V8 GAS DOHC Naturally Aspirated
2 Upsteam & 2 Downstream 2002 BMW X5 4.4i Top Line Sport Utility 4-Door 4.4L 4398CC V8 GAS DOHC Naturally Aspirated
2 Upsteam & 2 Downstream 2002 BMW X5 4.6is Sport Utility 4-Door 4.6L 4598CC V8 GAS DOHC Naturally Aspirated
2 Upsteam & 2 Downstream 2001 BMW 750iL Base Sedan 4-Door 5.4L 5379CC V12 GAS SOHC Naturally Aspirated
2 Upsteam & 2 Downstream 2001 BMW X5 4.4i Sport Utility 4-Door 4.4L 4398CC V8 GAS DOHC Naturally Aspirated
2 Upsteam & 2 Downstream 2000 BMW 750iL Base Sedan 4-Door 5.4L 5379CC V12 GAS SOHC Naturally Aspirated
2 Upsteam & 2 Downstream 2000 BMW X5 4.4i Lujo Sport Utility 4-Door 4.4L 4398CC V8 GAS DOHC Naturally Aspirated
2 Upsteam & 2 Downstream 2000 BMW X5 4.4i Sport Utility 4-Door 4.4L 4398CC V8 GAS DOHC Naturally Aspirated
2 Upsteam & 2 Downstream 2000 BMW X5 4.4i Top Line Sport Utility 4-Door 4.4L 4398CC V8 GAS DOHC Naturally Aspirated
2 Upsteam & 2 Downstream 1999 BMW 750iL Base Sedan 4-Door 5.4L 5379CC V12 GAS SOHC Naturally Aspirated
M73N Engine;2 Upsteam & 2 Downstream 1998 BMW 750iL Base Sedan 4-Door 5.4L 5379CC V12 GAS SOHC Naturally Aspirated