I had this issue last year a couple of months after the middle and back of my exhaust was replaced had it checked and nothing was wrong so it was re-set,had the same issue last week a few weeks after the Y-pipes and HFC cats were replaced but everything runs ok so did the pedal dance to re-set and now waiting to see if it comes on again if so I'll then have it checked out again does seem a bit of a coincidence though it's as if the ECU doesn't like the new clean exhaust and needs to re-learn what it feels like.