low oil warning light
Once you have confirmation there is sufficient oil in the pan, then you move to "why is it confused". Do not go over 4k means the high pressure oil pump mode is not developing enough oil pressure to trigger the high pressure oil switch. That it's during acceleration limits means the oil level is likely low enough that the pickup tube is in air. But there's no actual oil pressure gauge on the engine.
You never furnished how many miles are on the Q5!
As stated above you definitely need to purchase an oil dip stick to diagnose your problem. Otherwise you are just guessing…..













