I have a '99 S80 T6 with approx 140,000 miles. This morning the "Check Engine" light went on and the message window started displaying the "Emission System Service Required" message (it's not the gas cap). Here are the current symptoms:
Very rough idle At very low speed 5-10mph major jerking Ride becomes smoother with higher speeds At 50-80 mph the "Check Engine" light flashes about once per second instead of steady on, and the ride is fairly smooth.
Any ideas/clues would be appreciated! Thanks, in advance.
Alex L.