Last week I was driving on the highway in my 2015 Golf TDI and I heard a loud beep. I looked down at the dashboard and saw the orange triangle with exclamation mark along with a message. I only got as far as error service.... then it disappeared. Any ideas? I don’t have VCDS, would this alert be retained still kn the ECU? Bought her in February with 9,000 miles, I have 17,000 miles now.