ford mondeo lx 1999?

Try the connections under seats, (wait 15 minutes to make airbag safe) unfasten connections (Bright yellow) & reconnect. Sometimes they have bad contact. If this doesn't work then it will probably be the connection within steering wheel, which means removing steering wheel but always wait 15mins before doing anything concerned with airbag. Alternatively you can remove the bulb, like I did, because this problem was reaccuring, it takes a while but it solves the problem PERMINANTLY!! Regards..

John
July 2005