Airbag error glove compartment key compartment

Hello Forum, seat ibiza 6l fr 150ps 1.8l Motor 5türer. with my girlfriend lights up the airbag lamp again. About a year ago the airbag and a few more things were changed. Now again. First they said either cable or control device because it enters as soon as the steering wheel is moved. Now it is called the passenger airbag key switch should be defective. Now the question, for 150Franken let change, or for 25 Euro in the bay order a switch and exchange itself. (Of course, disconnect the battery and delete errors). Look forward to your information!