Hey everyone,
I have an '02 s60 2.4t, went to go to work this morning, car wouldn't start. I tried to boost it from another car later in the day, no change. Tonight, I tried to start it again, and took note:
Key in ignition II, dash lights cycle through, radio/climate lights on, fuel pump cycles, engine and oil light remain on.
I try to start the car: there is no sound, no crank, radio/climate lights go out, engine and oil lights remain on.
message reads: engine start prevented
Seatbelt light flash and chime sound when key returned to ignition II, engine and oil lights still on.
does anyone have any experience or information!?!?!?!!??!
​​​​​​​Thanks,

 

could be the immobilizer got set. Try locking/unlocking the doors with the key fob 5x (if you don't have a fob try the same with the door key) to reset the alarm system.

 

To close this topic off, here is what happened..
I had broke the key the night before in the outside door lock because it was frozen and I couldn't unlock my door.. the next morning going to work I had the key in pliers and the car wouldn't start. I read that the key has a chip in the rubber grip that allows the car to start. So I tried my spare key and it started no issues. I then tried the broken key again reinserted into the grip part and it also worked.

thanks for the reply.