sensor and clean it. Works a treat. Did mine yesterday and now the car starts first time, every time. Seems to run smoother too (less juddering/stalling at low revs).
Now all I need is someone to tell me how to get all my tyre pressure sensors working. I tried the over inflate, deflate cycle and the fuse 2 reset method and it's made it worse if anything!
Anyone know how to stop the dashboard dials doing the funky chicken on cold or damp mornings ?