Yeah , damn blasted bolts that hold thermostat housing top down , they are usually too tight but these bolts have only been nipped when I did the thermostat itself!
To get to coolant temp sensor it is easiest to take all the above off BUT stripped the heads , drilled em out and they complied....
Gotta find some proper bolts now.
Finally got sensor out.
What's the bet it isn't the sensor but the o2 ???
http://imgur.com/bE7nvWA