I have a 2004 Jetta TDI Auto Sedan. I have had the recall to have the 7v ceramic glow plugs replaced with 5v steel glow plugs + ecu update. There was a recall for the recall because the 5v glow plugs have issues starting in cold weather. Then recall expired. I have bought the 7v glow plugs plus the controller. I want to update the ecu to 7v glow plugs. I understand that I need to do a BDM read and do a backup and find a dump from another ECU that has this update then compare the files? Maybe someone who has done this before can point me in the right direction.

Duke

You need to downgrade ecu with vcp