Driving home tonight I had a CEL come on and the car is idling rough. 2014 S8. I have a DS1 so I ran the codes. At first it gave me a P0021 but after I cleared that it gave me a P0018 instead. Could it just be a sensor or could it have jumped timing with cruise control at 75 mph? Also I am having a hard time finding and info on positions of the sensors.
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