Oil pressure warning
Oil pressure sending unit maybe going bad .if you can hook up mechanical oil pressure gauge that will tell you the pressure.
Could be aN oil pump failure, take it back it is still under warranty.
Oil was recently changed 10 days ago. Then the alarm went off on an extended trip. Went back to lube place. I made them verify it had oil It was a half a quart low. The screen reading said "no information available for oil level. New oil was in the car and after 1 hour drive it sounded. Is a half a quart low mean it's burning oil? 45000 miles ?
At that rate you should be able to smell it burning oil out the exhaust.
take your car to the nearest audi dealer your car is still covered under warranty there is no reason for it to be loosing oil. Check under the car for leaks and if there is none then your car has an internal leak check your antifreeze for signs of oily substance in the reservoir.
Looking for a Used A4 in your area?
CarGurus has 10,940 nationwide A4 listings starting at $1,333.
Search Audi A4 Questions
Audi A4 Experts