Hey,

I have an 02 S60 that ive had for about 2 years now, and it has 130k miles on it. the car ran smooth until about 2 months ago, when it would idle super rough and shake the whole car. I waited about a week before trying to do anything with it, and i started it up and it ran fine. It kinda went through cycles of working, then not working. Recently it stopped working, but hasn't fixed itself again. I replaced the injector O-rings on the intake manifold and ran some injector cleaner through, but nothing happened. The dash display says "engine system service urgent". It didn't say that until recently, and it seems like a significant problem. I don't have a way to pull the codes as of right now, and ive had evap codes before, but i tried checking the modules with the dash display. I got the following:

BCM Checking
SRS Ready
TCM Checking
ECM DTC Set
AUM Ready
CEM Checking
DIM Ready
DDM Checking
CCM Checking
PDM DTC Set
PSM Checking
REM Checking
SWM Ready
UEM Checking

I'm not sure why it says checking on so many. I let the car run for about 5 minutes to see if it would change, but they stayed as "Checking". I can post videos of how the exhaust and engine sounds. It seems to not have a problem when revved above idle. All suggestions are appreciated.

Thank you.