LSU 4.2 Wideband O2 Sensor

The Bosch 0 258 007 057 is a 5-wire pump cell wideband oxygen sensor, identified as an LSU 4.2 type. This sensor features an M18x1.5 thread size, common for lambda sensors and spark plug bases. It is designed for wideband systems and requires a bung with an 18 mm diameter hole that has 1.5 threads per millimeter. It's important to note that this sensor is not electrically equivalent to LSU 4.0 or LSU 4.9 sensors and requires specific controller compatibility. While it can be used with some controllers that allow free-air calibration, a controller designed solely for an LSU 4.2 will not work with an LSU 4.9 sensor. This Bosch sensor is listed as a fitment for various Volkswagen models, including the 1.8T and 2.8L VR6 Golf, Jetta, and Turbo Beetle, specifically for AWW & AFP motors. It also supersedes older part numbers and is a common replacement for aftermarket ECU and motorsport applications requiring reliable Air-Fuel Ratio (AFR) monitoring.