I heard from the garage I'm buying my car off, and they informed me that unfortunately the EML came on showing egr fault code. So they removed and cleaned it and refitted it, And it drives perfectly after a long test drive, but the spanner light came back on, and still drives normally. They said I can have it for a couple of weeks and take it back and leave it with them for a couple of days if fault not cleared and replace EGR. It is under warranty so no worries there! They said I can leave it for an extra week before taking it but I need it for next week. Does driving it normally for a couple of weeks help the parameters adjust on ecu?