I have a 1993 civic lx and I was wondering about a sensor on my cylinder head. It is right behind a coolant passage elbow and looks like a knock sensor or a temperature sensor of some kind. It is single wire. The connector (or what seems like a connector) won't come off. Do I have to unscrew the sensor from the cylinder head to get it out?

 

wiggle it, it should come off

 

its a ground, if it wont come off take the rubber boot off there might be a nut (10mm) under it

 

i think he is talking about the temp gauge sensor

 

whhops yea take it off as throwdown said