Answer:
To fit take off the plastic cover which covers the engine and if facing the engine from the front its top left hand corner all you need is small star(allen type) screw driver to take screw off pop it out and put the new one in which will probely have a biger head to new part as i guess this is an improvamant
All in all about 10-20 minute job whish all fixs on cars were this easy
And indication to this being your problem is normley you can sometimes start the car let it warm up drive about park up and find you cant start it up again until the cars cooled down some people try putting the sensor in freezer after it wont start then putting it back on to find it starts ok