How can i fix my air bag electrics on a nissan almera?

Hi I recently changed my steering wheel on my nissan almera for one that does not contain an airbag however my car will now not run.
It turns over but the engine will not fully start.
My car is an P reg Nissan Almera I have contacted Nissan but they want to charge £200 for looking and with no guarantee that it will be fixed.
Please help