Hi all iv read similar threads but still can't figure out what's went wrong...basically I was driving down dual carriage when I came to roundabout and realised my car had cut out. Thinking I must have stalled it tried restarting and eventually called The AA. The car does turn over but wont star also has a horrible screeching noise from front and glow plug light flashes....My car has currently been in garage for 4 days with no diagnosis yet...any help would be great. It's a 2008 b8 a4 saloon 131k milesScreenshot_20180819-144932.jpg