Innovate Motorsports HBX-1 Heat-Sink Oxygen Sensor Bung ExtenderThe Bosch LSU4. 2 and LSU4. 9 wide band O2 sensors (shipped standard with Innovate Motorsport products) are rated to operate at an exhaust gas temperature of < 1,700 F (930 C), and a sensor housing temperature of < 1,058 F (570 C) measured at the hex, for maximum accuracy and control. When either of these operating temperature ranges is exceeded, the sensor can no longer be accurately controlled. Further, operating at or above these temperatures for