Feuling O2 Oxygen Sensor 12.5&Prime, 9900 Precision manufactured with a ceramic body made of stabilized zirconium dioxide, surface coated with gas-permeable platinum electrodes and a porous ceramic to help prevent erosion due to contamination and particulates in the exhaust gases Narrow band O2 sensors available in 12.5in., 16.25in. and 22.25in. Replacement Wide Band O2sensor for aftermarket ignition tuners also available; overall length is 30.25in. All sensors meet or exceed OE specifications Some products may not be legal for sale or use on pollution controlled vehicles; check your local laws and the manufacturers information