Assuming this is the vehicle speed sensor (there is also an engine
speed sensor) it appears to be close to the back of the air box.
The instructions at alldatadiy.com (cost $25 a year) show removal
of the preheating hose from manifold to air cleaner, then the
hose from air cleaner to turbo, then you have access. The web
page only has pictures (drawings are typically better) for this
procedure and they are kind of hard to see. In any case, you are
in the right area.

The instructions also note to use a new O-ring, oil the O-ring and
torque bolts to 5.5 Nm. (who has a torque wrench that goes that low?).