Need firing order diagram with cylinder numbers for my 2006 S60 2.5t. Started missing and check engine light came on auto part store scanned with code reader and they said number 3 cylinder. So I'm assuming coil pack or spark plug?

 

Cylinders are number 1-5. #1 is closest to the timing belt.

If you have a miss-fire - (and you have no way to check compression) After you have verified the spark plugs are not causing the problem (pull, inspect, when were they replaced last?) Swap coils with a working cylinder to see if the miss-fire moves. Then if it does can you isolate the coil as being the problem. (before buying parts you may not need)