Hi guys my mate has a vx220 turbo and he has had a few problems gettin it started etc. but he just need to know what this plug does if anyone can help.

i know it isnt an astra but surely this plug has gota be on both the astra aswell as the vx220

its under the water bottle and plugs in by the lambda sensor

heres a picture its the unplugged one?

any help appreciated...