Ok guys im having an issue with my silvia and its bugging the heck out of me. The car is getting bad mpg and my first assumption was the maf but after cleaning it nothing has changed. My next guess is that its my coolant temp sensor. My question is, is this it in the pic(red plug)
-oefv-jpg

if not then what is this sensor? i notice it makes a strange ticking noise when i BARELY tap my throttle. It doesn't do it when this sensor is unplugged however. would it be ok to drive the car without this sensor plugged up? Please LMK ASAP i'm lost tbh