im sure that is the lambda plug

as what esle can it be for

the 3 wire sensors are live and earth and a signal

3 wire is for a heated element

so the 2 same colours are your lives and earths and the other one is your signal


so on that plug if lambda

black is switched igntion
brown is earth
white/brown is signal

but just wait until someone else says thats correct

as ive never ran a lambda but i did ask the question and this is what i was told !