Sounds like incomplete fuel ignition, but could be caused by several different things. "Safe" is a difficult thing to determine.... on a scale of risk, I would say that it is relatively "safe" for you, but it may not do the car any favors. At most risk is likely the exhaust system due to fouling by unburned fuel. It is probably best to flatbed it there or a reputable Audi shop.
2018 Subaru Crosstrek, 2014 Audi Q7 TDI, 2013 Subaru Forester, 2013 Ford F250 Lariat D, 1976 Ford F250, 1969 Chevrolet C20, 1969 Ford Econoline 100
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Answers
Thanks