Air bag light on

[Harry2479]

My 2015 m8 air bag light has come on,it says on the code reader driver side door impact sensor, so removed panel and there is no sensor there, on advice from ford they said it would be the seat belt stalk which has now been replaced and the light is still on,after checking the only sensor I can see is the 1 In the front grill behind the lock could it be this 1 that needs replacing.any help would be greatly appreciated.