as above to make sure 100% what the fault is id get it on a diagnostic machine, find a local garage to do it as they will charge you loads less than citroen and the the chances are you will get a better level of service aswel.
the Airbag light menas that something is wrong with your airbag system, chances are it will be the connectors under your seat. cut them off and replace them with bullit connectors
as for the engine light it could be anyting from injector faults to a bad earth to corroded wires. sounds werid that it doesnt affect performance though
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