Had the same issue when my 2017 S4 was new. They changed the high pressure fuel as they thought it maybe leaking fuel into the oil, this didn’t fix it so they fitted a new level sensor but I still get the warning every now and again in the winter.
Last month I found the attached TSB ( my dealer...
DTUK tuning box for B9 S4/S5 with Bluetooth control for sale complete with box and fitting instructions. Will remove from car this week and post pictures. £200 signed for delivery in the U.K. payment via PayPal.
1 last question then I will attempt to fit my RS paddles, In the instructions it says disconnect the battery with the ignition on and reconnect with the ignition on. I can understand the disconnect but how Turn the ignition on before you reconnect ?