Coolant sensor location , parasitic battery draw

[Halfpint]

Been having a few issues with the location of the coolant sensors , we have found 1 at the bottom and cant find the other 1 , the fault code is telling me thats what is wrong with it , also ever since i had the fuel injectors replaced i have have had parasitic battery draw from somewhere , are the sensors the problem  ? And if it is i really need help to find them , i have been at this for 5 weeks, 

Thanks guys.

[Vauxhall Owners Club]

Maybe the sensors have been connected up wrong....have a look at two sensor near each other on the engine around the glow plugs area that may have been disconnected and reconnected wrong

[Halfpint]

Sensors went in ok , fault is cleared but still getting massive battwry draw , 24 hrs and the battery dies