A few weeks ago my oil light came on while driving. It said add a quart but I could keep driving. Went the next morning to have oil changed. Correct amount added. Light came on again same day. Goes off when I open hood and shut it. No indication of oil loss in garage or parking spot at office. Audi store says they can look at it in 2 weeks. Out of warranty. I am guessing it is either the oil level sensor in the pan or the sensor in the hood latches. Any way of testing on my end? Thanks in advance.