My 2008 S40 is randomly misfiring, causing the check engine light to come on. My OBMII meter sometimes shows a misfire with cyl 5, or cyl 3 or cyl 4. It is never just one cyl, it varies. Is there a coil pack relay?? Thanks, Marco

 

looks like a duplicate post. See my response in the other one. PS - I moved this to the S40 board as "forum issues" is the board for issues with the forum (not cars).