You're sure all the sensors were replaced? It takes at least 2 to trigger the airbag.
The codes I see (now these are for my 90)
4- potential short in airbag deployment circuit
5- foreward crash sensor circuit shorted to ground
or combine to get 9- open foreward crash sensor deployment circuit
Could be a faulty replaced front crash sensor (front left, right or center)
Could be a faulty ground or a short in the system. Check the front crash sensors. Once they are triggered they must be replaced. They are black rectangular units near each corner and one is I think near the center rad. support.