Before you allow them to replace any parts ...
Disconnect the battery, and wait 20 minutes.
Now check the various electrical connectors under the seats and by the seatbelt plugs. Wggle them around, disconnect and reconnect them, making sure they're all firmly locked into place.
Once finished, reconnect the battery, and, if you're lucky, the fault might be fixed.
Basically, those connectors get knocked, items under seats, etc. They then don't connect fully, and a fault is registered.
The battery / 20 minutes thing is to allow residual current to disperse. The last thing you want is the airbags firing off when you re-connect stuff !
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