BOSCH 13559 Premium Original Equipment Oxygen Sensor - Compatible with Select BMW 318i, 318is, 318ti, 540i, 740i, 740iL, 840Ci, Z3

Bosch Premium Thimble Type Sensors utilize an electrical heating element inside the thimble-shaped end to bring the sensor up to operating temperature in less than a minute. The patented thimble ceramic element featuring the Bosch patented Platinum Power Grid and the patented Bosch Double Layer Protection System optimize sensing, peak performance, and maximum service life.