Airbag light

My airbag sign came on randomly and every-time it stayed on the seat belt sign with the chime went on saying the seat belt was unfastened when the seat belt was fastened. So I took to the dealer and they could not find anything because it was not on when I was there. But they diagnosed it and gave me a paper with all the error code that was on the car. I have already changed the fuse on my car for the seat belt and air bag but it did not helped.

Here is the air bag sign blink pattern whenever it does that:

4 1 5 5 1 5 1 5 1 stayput


here is the code that I got from the dealer:

X204 engine Control Module DTC - Summary V6

Permanent P0480 Cooling Fan 1 Control Circuit Malfunction

Permanent P1260 Security Input - Engine Disable

Permanent P1582 Flight Recorder Data is Stored

Permanent P1632 Generator Charge System Failure/Generator Load Feedback Circuit Failure

Historic P0172 System Too Rich (Bank 1)

Historic P0175 System Too Rich (Bank 2)

Historic P0300 Random Misfire Detected

Historic P0301 Cylinder #1 Misfire Detected

Now I want to know how much would I need to shell out of my pocket to get my car error free or are these error not that big of a deal and are those history errors something that has been already fixed but the data is stored and what about the permanent ones? I want to fix it but want to know how much would I be looking at when I go to the dealer.
Thank you.