Part 4x43-14B422-AD is an airbag module sorry do not know how it is attached this may help http://www.jagrepair.com/images/TSB/SRS System.pdf
Did you ever manage to resolve this? Whatever it is is loose under my passenger seat and I am getting airbag sensor code 16 on the dash.on X type 2006 2.2 diesel se saloon I have component hanging loose under front passenger seat, part number
Please can someone tell me what it is? and where it should be attached?
In the event, my car went to the garage for a turbo and actuator refurb, and MOT, so I asked them if they could fix the sensor, and they did. It definitely didnt add much to the bill so looks like it was as simple as you suggest.Doubt its in the manual.
Should just need fastening back in position.
Doubt you need to replace. Plus a new/2nd hand would need coding to the car.
When I replaced my seats I had to swop the sensor from old seat to cure light. Can't remember code it produced.
Lift the seat and will see the position it takes. Its plastic sensor to metal base so screw is best.
Once seat is up you will wonder why you hadn't done it already.
its 2screws and 7bolts to access. At worst put couple of washers on screws and bend the sides of washers to make a securing frame to hold it.