172 Temp sender issues

[Blackdavid]

Hello guys.
I'm having some trouble figuring out a coolant temp sender issue.
Temp gauge stays low all the time, fans working all the time and for about 2 mins after I shut the car off.
Checked on diag for live data and its steady at -40°c.
Sensor changed, wires to the ecu checked for continuity, all the same.
Having some really bad mpg so i'd start with that.

 

[Ol’ Tarby]

Have you changed the thermostat aswell?

 

[Blackdavid]

Not yet, i've kinda focused on that -40° the diag is showing me.

 

[npt]

Start with the thermostat, it's a service item but most leave it until it fails, it's likely your issue