Can any 1 help me out there I took my focus st170 to get fault codes it came back with bank 1 sensor 1 and bank 1 sensor 2 so I changed sensor 1 my engine management light went out but when I drive it in the mornings the eml comes on a bit down the road if I take the fuse out and put it back in it stays off any help would be great

 

Sensor 1 is the pre-cat sensor, and sensor 2 is the post-cat one, so I'd look into changing that too.

 

Thanks I will look at that its only comes on when I am going to work in the morning when I get to work and pull the fuse out and put it back in I can drive home and the eml doesn't come on till the next morning

 

Exact fault code text and/or the number may help.