Yea as Ian says
Looking from the front of the car it's on the Right Hand Side of the engine (towards the front half), above the gearbox.
On my 180phb (AUQ) you also had to remove the small plastic trim that goes along the front & right hand side of the engine to get to it.
Again as Ian says be carefull of the clip, it'll ping away very easily. Sensor pulls straight out.
Also to save you from having to drain the whole engine coolant, open the expantion tank and let the preasure equalise then shut it again, when you remove the sensor you'll lose only about a cup-full of coolant