The reverse lights on my 2009 1.8 Ivtec stopped working. Turned out to be the reverse light switch in gearbox. To change it you need to remove the air filter box. This is tricky as there 2 10mm bolts and one rubber grommet. The technique is to unscrew all the connecting pipes and pull the box up until that grommet comes off. The sensor itself is a 27mm socket and the replacement £11 online needs 29NM torque. To give yourself more room for your hands select reverse gear and this moves the lever out of your way. Hope this helps someone else. I have a picture of the sensor but being a new member I am probably not allowed to post.