You need a full VCDS scan first, then you can see the specific error code regards engine management light. This could be a wire break, which is an auto-electrician job. Removing the bumper, takes 30 minutes - so don't be freaked out by that. Dash out is a different ball-game and I personally wouldn't entrust with anyone other than a specialist (non main-dealer). Working clean, space in workshop, anti-marring tools, etc.