Bosch 17091 O2 Sensor FA-Style High-quality steel

High-quality steel

The halo protrusions at the top provide additional head support in the event of a side impact

Note: 94-97 GSR and Type R with taper bearing design can be upgraded to these ball bearings by changing the preload shim

this plug cover is finely constructed from aluminum and anodized black for a smooth matte finish

Bosch 17091 O2 Sensor FA-Style High-quality steelBosch 17091 Premium Wideband A F Oxygen (O2) Sensors are designed for use with aftermarket high performance wideband kits. Wideband air fuel sensors perform the same function as a regular O2 sensor, but they precisely measure the amount oxygen in the exhaust rather than just switching between rich (too much fuel, not enough oxygen) and lean (too much oxygen, not enough fuel). Our wideband sensors use a more sophisticated sensing element that provides