Look at this link, it states the warning lights that are to be checked/working in the mot test - http://www.theaa.com/motoring_advice/car-servicing-repair/mot-changes-2012.html But then if you go down to the supplementary restraints bit it states - "The vehicle will fail the test if any airbag fitted as original equipment is obviously missing or defective." So it appears that wether or not the bulb is working etc it will still fail if the factory airbag is missing making the aribag dash light bulb test irrelevant. But then again, if you have an aftermarket steering wheel which is designed