During a good run on the motorway when I come to a hill and load then engine up a bit I get the CEL coming up, always with a misfire on cylinder 1 detected.

Those nice chaps at Xtreme have replaced my plugs and the coil pack, but I'm still getting the same thing. I'm booked in for a session with them on a rolling road at the end of the month to look at this further, but I just wondered if anybody else has had the same thing?

 

Had this not long ago and did same, changed plugs/packs,
ended up it was the lambda sensor.

worth a look.

Could try cleaning it first before buying.

WW