Re: 2001 Merc Optimax fault sensor limp home throttle
This message could be any one or combinations of several sensor failures. Based on limp mode, I would guess maybe the TPS has gone south. TPS failures are fairly common on the Opti's of this vintage. What you really need is to get a Merc dealer to plug in the DDT or CDS. It will tell them exactly which sensor failed. Good luck.