My 2006 Limited Expedition just started having the airbag light come on after about ten minutes of driving. The airbag light will flash a two digit code, for this repair the light will flash (4) times then pause then flash (2) times and repeat for three sequences before lighting up solid. A detailed repair with pictures was found on the F-150 forums: http://www.f150online.com/forums/electrical-systems/393407-airbag-light-dtc-42-fix.html My Expedition had the same problem with the front impact sensor, limited connection corrosion, but once replaced no more airbag light. I did not cut mine open per the link but I'm sure it was gummed up inside. Part Number for airbag front impact sensor: New Part #6L1Z-14B004-AA Old Part #6L1Z-14B004-AB The new sensor hit me for about $60 including tax.