My wifes S80 has a terrible misfire. One Cylinder is definitely not running.
The Check engine light keeps flashing. How do i check to see what code it is?

What could the problem be? IS this a common thing with S80's?
It's a 2001.

Could it be a bad coil?

 

Bad coil or plug. Worse case burn't valve. But coils are common.

 

Good to hear.. IS the coil a dealer item only or can i get it elsewhere?

 

You should be able to get a Bosch one (OEM) from places other than the Dealer.

 

Have Autozone read your codes, it will tell you what cyl. is misfireing.