What is the best angle to remove the sensor? , from under the hood or under the car? and what all would be the best conditions to remove it? hot cold? with Some kinda lube?.
Just wondering and any help would be great, i cant seem to get to it the way i need to in order to Get it free

 

PB Blaster will definitely help. Some people suggest taking a hammer and knocking the top part off leaving the large nut to remove. A breaker bar also helps in addition to a pipe to place over the breaker bar handle to add a decent amount of leverage for leverage is your best friend here. And removing it from the top is the best angle.

 

this sounds like its going fun!, would i need a rather long extension to get to this?

 

If you need extra leverage by using the pipe over the breaker bar handle then you'll need a fairly long extension so you have enough room to operate with and not worry about banging into something when removing the sensor.