If you slide the glass part back about halfway, then (if you have a skinny arm) pull down slightly on the inside shade and put your arm back there and push downon the shade, you should be able to get the shade slid back where it should be.
If you WANT to change your oil, go ahead and do it and there are instructions in the owners manual on how to reset the oil change reminder (FSS or Flexible Service System in your owners manual). Or else a competent shop can change it, whoever you are used to do it for you, the important thing is to get it done and to learn how to reset the indicator.
The check engine light is a seperate matter but should be investigated soon at a competent repair shop, preferrable one specializing in newer European vehicles or a dealer.
Gilly

__________________
Click here to see the items I have up for auction at EBay

Click here to see a photo album of my '62 Sprite Project Moneypit (Now Sold)