Picked up my new sl55 yesterday and twice today the ABC light came in in red saying drive carefully. Fluid is at proper level. I had replaced the entire system in my previous sl500 so im familiar enough with the system in that regards. From my research it seems to be either a faulty sensor or faulty accumulator (the rear accumulator failed the bounce test when i tried it out). I wont have access to a star tool for a bit and will be parking the car for a few weeks as of next week. Any insight into this would be appreciated. No leaks on any lines, valveblock, strut etc. and no sagging at all. Light flashes for a second and goes off, no malfunctions in the dash display. Help me out guys!

Sounds like you are pretty familiar with the ABC gremlins. The only thing I might add is that occasionally when the hyd pump starts to fail, they will intermittently produce enough pressure to make the system happy and other times not. I had this happen on my SL.

accumulator

thanks for the response guys, ordered an accumulator and abc fluid and getting this sorted

Do all the accumulators while you're at it

front one was replaced 2 months ago by previous owner, supplied with paperwork.