This is the main wiring harness from our WMS Wideband O2 sensors. It is a complete harness from controller to the Bosch / VW LSU4 wideband sensor along with power, ground and 4 other option wires. Plug on the O2 sensor end fits Bosch / VW style sensors (Bosch part 0 258 007 057). Plug on the controller end is a 10 pin rectangular Molex 43025. High quality wiring to repair or build your wideband system.