I had a crash, dismantled my whole left side (car wheel is on the right side) and fixed everything cosmetically, when I tried to start the car after ignition is turned on I push the key further to start it and nothing happens. I got immobilizer problem and airbag problem displayed on the screen. Any ideas how to fix all that? Thank you very much!

 

first thing is to see if you can reset the immobilizer via the key fob. try locking/unlocking the doors 5-6x with the fob. For the airbag light, you'll need a volvo friendly OBD2 reader to scan for the chassis codes pertaining to airbags to see if you can read/clear.