When I boought my 05 1.6 Focus It had had one owner from new, unfortunately he never took it back for the recall which related to the windscreen washers also giving the engine a wash to! So I ended up the one scratching my head with a missfire problem and water.This has been sorted however it's left me with an intermitant engine warning light which the code for is the lambda sensor.I'm wondering is it an easy fix regarding wiring it in?I assume it's a plug in connection some place?

Unplug, unscrew, replace, straight forward.