Yesterday exhaust warning lit up again. I had it go off once before and serviceman turned it off in 2 minutes with a computer, and said it was something with the air-fuel mix.
So now it got set again, but then I drove for some time, refueled (V-Power, what else) and it disappeared.

Anybody had this problem.
Maybe cold weather has something to do with it. Did not have any problems in the summer and autumn.