Join Date: Dec 2008
County: Western Australia
The only way to access the passenger airbag is to remove the dashboard (it is bolted to the top underside of the dashboard itself). I had to remove/replace the dash on a 159Ti to replace the passenger airbag. It is a lengthy operation. If the dealer is going to do it, I would definitely take note of what pieces are loose/damaged already, as they are likely to break things doing it. I used the eLearn software to help me do it - I couldn't have done it without it.
In all, I did the operation and didn't break anything, but I took my time with it. I suspect dealers may try and do it as quickly as possible and likely (unintentionally) damage things doing it, as it is quite a delicate process. Again, make sure you take note of anything which is already loose/broken for your reference.