Car wiring diagrams: Bmw 4 Wire Oxygen Sensor, wiring diagram, wire wiring harness, schematic circuit diagram, wiring diagran, wireing diagram, wirring diagram, wiring daigram, wiring diagrams. Old, worn out oxygen sensors can cause poor mileage, low power and a variety of fuel injection problems. Learn to replace them today with our article..Jared Fenton discusses the in and outs of oxygen sensors..Bosch Wire OE Replacement Oxygen Sensor. Bosch is the number oxygen sensor brand in the world. Each sensor ensures your vehicle's fuel efficiency at its optimum .