The air bag light can only be reset using the appropriate diagnostic equipment. It doesn't have to be a vauxhall dealer, lots of independents can do it. It only takes a couple of minutes to do the job, phone around for the best price.
The light will not reset if the fault is still there.
Check the wires under the front seats, if your Dad was moving the seats back the connectors can come loose, this will put the airbag light on.
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April 2009