From: wolverine01@charter.net   
      
   On 2/5/2025 3:46 PM, Carol wrote:   
   > sticks wrote:   
   >   
   >> On 1/27/2025 1:31 PM, sticks wrote:   
   >>> Been just starting the RV up on Sundays to keep the batteries   
   >>> charged  and I usually just let it warm up and run for about 20   
   >>> minutes.  Last  weekend the damn check engine light was on again.   
   >>> Put the OBD2 reader  on it and sure as hell there is 2 new faults   
   >>> showing up.  I'll have to  take it back to the shop I guess.  Yeah,   
   >>> these damn Mercedes are very  impressive.   
   >>   
   >> Talked to the service guy at Mercedes today.  He's got me thinking   
   >> that it just might be the idling that has caused this error.  This is   
   >> the first diesel I've had that uses DEF and has all that newfangled   
   >> emission stuff.  He claims idling is not good on modern diesels   
   >> because it can foul up the DPF (diesel particulate filter).  I guess   
   >> these things do a regeneration cycle as needed, but it is done only   
   >> at a fully warmed up engine and while actually driving.  I guess it   
   >> gets hot as hell.   
   >>   
   >> So, I guess when I get a chance I'll pull it out and take it for a   
   >> spin and see if the damn lights go off.  Would be nice if that's all   
   >> it is.   
   >>   
   >> Also gotta figure out a way to get a battery tender out there.   
   >   
   > Yes, ran into an article on diesels.  Partly polution related (very   
   > slanted) but it did mention that they don't do well on idle.  The   
   > fellow was recommending a law that diesels not be allowed to idle more   
   > than some short time (2 minites?  We have lights longer than that   
   > here).  They wanted them to turn it off then restart.  Problem came up   
   > that that costs more gas than idling.   
      
   After a little more research I'm fairly certain the problem is that it   
   needs a regeneration.  I guess they kind of do this automatically as   
   often as every 500 miles.  Most people, like me, don't even know about   
   it.  Seems like there should be a little more information given to the   
   customer since if you do what I did the check engine light come on and   
   you have to haul the RV to the dealer if you don't know what is going   
   on, when all you have to do is just run the thing for an hour or so.   
      
   I'm still a little uncertain if once the check engine light come on if   
   it will do an automatic regen, or if you have to take it in and do a   
   forced on.  I guess I'll find out.   
      
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