I have just got my astra 2l turbo convertable back after my turbo began playing up. The garage sent the turbo off got it reconditioned and upgraded to a vxr spec, then had custom remap. Also new coil pack. I picked it up yesterday. I went for a drive earlier and the light came on the dashboard of a car and a spanner, the book says this is something to do with the electrics or auto gearbox (mines a manual). we have also noticed when idling blue/white plumes of smoke which get worse when i press the exelerator. Since the turbo was changed the garage have driven it to essex twice. I think its the tutbo am i right?