AO Gold Member
Join Date: May 2008
Location: United Kingdom
County: Perth and Kinross
Re: 156 2.5 v6 non starter.
Hi, and welcome!
I've only experience of the 4-cylinder 156's, but on them there is an antenna around the ignition switch with a wire that connects to the immobiliser.
These can become detached, which prevents the key's code from being read.
Airbag lights are often a sensor fault (the airbag has a separate ECU, so unlikely to be related). The dealer will be able to tell which one is acting up.