Alienatrix

Hi everyone, First time A3 owner here. Currently own a MK8 GTD, however needed a second 'runaround workhorse' and saw this beautiful black edition and I knew I had to have it. It's a 2.0 TDI (138) manual, 2009. It does have some minor issues it needs fixing and wanted to see if these are common and easy enough to fix. 1. Oil Level Sensor faulty - Should I be worried, or is it just a sensor as it suggests? I have checked oil level and it's perfect every time. How much does a sensor usually cost? 2. Air con light doesn't stay on. I will be getting this looked into. But my OBDEleven device seems to suggest it's the 'Air Quality Sensor'. 3. Car pulls ever so slightly to the right on motorway. Is that most likely a wheel alignment issue? No vibration at the wheel at any speed, just a slight pull to the right as I say. 4. Finally...the smell. The car is a 2.0 TDI (138) and I have been told its remapped. Boy can I smell the fuel when the door is open but. Is that normal following a remap? Thank you all and look forward to a few years of happy motoring with my new A3 😀.