Final Update (I hope)


MB USA identified new software for the ECU, sent it to my dealer and my dealer loaded into my car. My service writer explained that the code indicated the engine was running too rich and the new software leans out the mixture.


During my 10 minute drive home from the dealer the check engine light was off and stayed off. Also, this could be totally the placebo effect, but I swear that during braking and deceleration, the exhaust was quieter and exhibited less popping. I was in Sport+ mode, so that should have maximized the exhaust popping.


In any case, if the new software really does lean out the engine, then perhaps it will yield more power and better MPG.


Meanwhile if any of you get a mystery check engine light, definitely tell your dealer about the new software.


Cheers


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Update


Got a call from my dealer at the end of the day. The service techs got a code from my car that they had never seen before and for which they have no factory directives. They have sent the code and associated data to MB USA and are awaiting further instructions.


Perhaps I will get an update tomorrow.


I really do think MB should be paying us for beta testing.
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My sunroof is still working well after its repair. Sadly, now my check engine light has come on. No, it is not a loose gas cap. The light came on last night on my drive home from work and continued to be illuminated when I started up and drove to work this morning.

The car seems to be driving normally. My service agent told me if it was something really serious the light would flash rather than just come on continuously.

I have a service appointment for tomorrow. I will update.

I am starting to feel like a beta tester and I was expecting things to be a bit more solid. I hope this will be the last surprise for a while.

 

Damn dude... I'm supposed to get my car back Thursday (for sunroof shade/Sirus/Door fixes, as well as rear diff fluid change)... I'm praying I don't see any more issues.

I've been without the car for a week and I'm getting sick of the C300 ;/

Hope it turns out to be something simple!

 

Unfortunately, that's always been my fear of first MY cars, and why I avoid them. Because that's how I would feel too.

Sorry to hear that the issues keep coming; I'm pretty disappointed with the W205's apparent lack of quality so far, but I remain optimistic that things will get resolved, and future MY's will continue to improve.

 

Curious to see what your code was?

 

updated

 

An undocumented code? You are a beta tester.

 

Keep us posted.

My c63s has been trouble free (except for the goofy trim below the doors). They will be replacing that tomorrow.

 

Funny you say that. I just had the same trim replaced on my passenger side.

 

updated

 

My software was also updated for other issues. I hope the MPG is improved. I was averaging 16 around town.

 

JPM do you notice your exhaust quieter as well?

 

That may be a "user issue" ;-)


Just remember, with great power comes great responsibility.