Sensor de oxígeno O2 ascendente+descendente 4 piezas para BMW 320i 325xi 330xi 525i 530i X3 Z3 Z4
Downstream location is between the catalytic converter and the tailpipe. Oxygen Senosr. Q: How do I know the O2 sensor is good or not?. FAQs About Oxygen Sensor. Q: Why should we replace the bad oxygen sensor?.