I have a 4 year old A6 S Line with 110k on the clock. It’s predominantly driven in economy mode due to mileage. Over the last few months, when I switch to sports mode to overtake the coil warning light comes on and some power is lost. I stop quite soon after, restart the engine and it’s gone. The coolant level is fine so any ideas? I’m trying to avoid taking it to be looked at. I’m thinking of just avoiding sport mode going forward!