Did mine not that long ago, used a guide on here on how to do it (need to be a paid member to access it, £10 for a year, go on!!!) First you need to disconnect the battery and leave for about ten mins for system to disable (better safe than sorry). Then, im just going by memory here, i think it might be 13mm torx screw you need, to unscrew the two screws at the back of the steering wheel. this will allow the airbag unit to come out. You need to also unscrew the bottom part of the dash cover(where ur keys go into ignition, philips screw driver) to allow you to unplug/disconnect the airbag, its