Air bag warning light flashing

Hi.

My husband's 2003 Ford Ranger has an airbag warning light flashing. The old port is very old and 2 auto electricians have plugged in reader's but cannot read the error. It's giving a blink 22 code I believe. Two garages have looked at potential faulty connections but haven't been able to stop the light flashing. The car is mechanically sound as the mechanical carried out the work on the other items it failed on first but cannot fix this. Would it pass an mot if the bulb was removed or blacked out? I know about the fault with the air bag and it being a potential issue however it is my husband's truck that is used on our farm for tiwingbtraulers for hay baling etc but needs an mot for the short road journeys between fields. Thanks in advance for any help.