The Bosch LSU 4.2 Wideband O2 Sensor supports closed loop O2 maintaining optimal fuel delivery by delivering accurate measurements of the engine's air-fuel ratio to the ECU in real-time, determining the lambda value. 

Fuel Compatibility:
The Bosch LSU 4.2 WB-O2 sensor is compatible with unleaded gasoline, ethanol gasoline blends, methanol, and diesel. However, the sensor's lifespan is significantly reduced when used with leaded fuel, diesel, or in 2-stroke engines. 

Thread Size:
The Bosch LSU 4.2 sensor has a thread size of M18 x 1.51.

Part Number: 0 258 007 057 (VW Number: 021-906-262-B)2.

Additional Information:
Remember to handle wideband O2 sensors with care and never remove the O2 sensor connector during operation. If you have any specific applications or questions, contact our Tech Support or Sales department.

Installation and Calibration:
To operate the sensor effectively, it must be paired with a wideband O2 signal conditioner (also referred to as a wideband O2 controller). When paired with a FuelTech wideband O2 sensor controller, the sensor is automatically calibrated. 

Compatible Wideband O2 Sensor Controllers:

• NanoPRO
• WB-O2 Nano
• Wideband O2 Weld Bung
• Bosch 4.2 WB-O2 Sensor Plug Kit