Harry Bloomfield, Esq. wrote in
:

Bazza formulated on Tuesday :
My query is, how much of a job is it to replace without risking the
air bag going off.

Disconnect the car's battery, then wait an hour before starting work.
Air bag should be safely discharged then.

I think I would - but logic tells me that the airbag needs to be triggered
by something in the car that would not be active when the ignition is off.