Moin together, I drive a SLK 230 compressor from 2001 With me since last night the demon light is shining. Error P0131 is shown to me. Did someone ever have this and can help me? Oil stop cable is installed, camshaft adjuster is also clean. I pulled off the plug of the Lambdasomde yesterday and cleaned it with brake cleaner. But there was no oil in the plug. But can this be the reason? How old is the Lambdasomde, I can’t say.