I changed the rear left ABS sensor unit this week, but the abs signal still appeared in dash, what can i do?? Is there some way to reset it like the maintainance or the eps????????????

 

What lead you change the "rear left ABS sensor unit" ?

 

Was it damaged? These rarely ever fail. It's possible to run through some nasty stuff and get crap on the sensor (or on the toothed wheel) and cleaning helps.

AFAIK sensor problems are only reported as they occur, and though they store codes the light will not stay on. I would think for the light to stay on it's a hard failure and is a severed wire or a bad connection somewhere.