For about a year I have had an airbag warning light showing on my 2006 BMW 335ci which has covered a mere 15,000 miles. Last week I had it booked in to the local BMW dealer and received a severe shock when the bill to replace the defective switch, which is fitted into the steering wheel hub, came to £521.90. Does this seem reasonable to you and can a switch really cost £355.84? The car has never been in an accident or had anything occur that could have caused this breakdown.