what is this, it fell from my car
 

I was getting out of the car and clipped this and it cam off. when i returned to start the car, nothing, I rang my wafe thinking id broken the key but neither key strarted. its im possible to push this ring on. I seen a kid do it in 5 seconds on youtube. Iv been at it 5 days.a warning comes up on the dash saying igniyion didnt wrok, try once more. 2008 2.00d by the way/ apologies fro my spelling, i lost my glasses that night.


https://www.ebay.co.uk/itm/174284934...0aAuM8EALw_wcB

It's just a bit of decorative plastic so would have no effect on starting the car. Probably best to find the appropriate section for your model and make a post with the exact way that your car doesn't start to see they can give you some pointers on what may be wrong.