BMW R NineT Oxygen Sensor Protection. A protector for your oxygen sensor is no superfluous luxury. This product is especially for your BMW R NineT custom Scrambler, Cafe Racer or tracker. Your oxygen sensor is an important part. It is easily bent or damaged. This gives you big problems with fuel management. It is almost impossible to repair and will have to be replaced in case of damage. This can be an expensive intervention. This protection is definitely a good idea!