MB Diesel engine recall

[cws196]

Picked-up my C250 today to find that the engine software has been updated (without prior warning) as part of an MB recall.

Not very happy as no prior warning and concerned about effects on mpg, performance, egr failing.... all issues VW owners have had after their emissions saga).

Has anyone else had the ‘fix’ done and noticed any changes etc?

 

[rf065]

Picked-up my C250 today to find that the engine software has been updated (without prior warning) as part of an MB recall.

Not very happy as no prior warning and concerned about effects on mpg, performance, egr failing.... all issues VW owners have had after their emissions saga).

Has anyone else had the ‘fix’ done and noticed any changes etc?

Are you certain? Mine had an update last time it was in but it stated it was for the drive train.

 

[GeeJayW]

Are you certain? Mine had an update last time it was in but it stated it was for the drive train.

Ours too.

 

[grober]

https://www.daimler.com/documents/i...elle-diesel-rueckruf-published-by-daimler.pdf
Exhaust scandal: Daimler has to recall 60,000 diesel Mercedes | tellerreport.com
This refers to a recall on OM651 engined GLK models but might be applicable to other models .
Centres round the following
As early as April, the KBA had initiated a formal hearing against Daimler in the case. Bild am Sonntag reported back then that the KBA had already encountered the controversial software function on the OM 651 four-cylinder diesel engine in October 2018. Further emission measurements in a model with GLK drive would have substantiated the suspicion in April. The KBA found out at that time that the statutory limit value for nitrogen oxides in the New European Test Cycle would only be met if the so-called desired coolant temperature control was active: it kept the coolant circuit artificially colder, delayed the warm-up of the engine oil and ensured that the limit value for nitrogen oxides. On the other hand, the function was deactivated on the road and the Euro 5 limit of 180 milligrams of nitrogen oxide per kilometer was clearly exceeded

What is not clear is what happens with any software update?? If it necessitates continually running the engines at lower temperature to keep NOx levels down then thermal efficiency and fuel economy may suffer???

 

[Bellow]

https://www.daimler.com/documents/i...elle-diesel-rueckruf-published-by-daimler.pdf
Exhaust scandal: Daimler has to recall 60,000 diesel Mercedes | tellerreport.com
This refers to a recall on OM651 engined GLK models but might be applicable to other models .
Centres round the following
As early as April, the KBA had initiated a formal hearing against Daimler in the case. Bild am Sonntag reported back then that the KBA had already encountered the controversial software function on the OM 651 four-cylinder diesel engine in October 2018. Further emission measurements in a model with GLK drive would have substantiated the suspicion in April. The KBA found out at that time that the statutory limit value for nitrogen oxides in the New European Test Cycle would only be met if the so-called desired coolant temperature control was active: it kept the coolant circuit artificially colder, delayed the warm-up of the engine oil and ensured that the limit value for nitrogen oxides. On the other hand, the function was deactivated on the road and the Euro 5 limit of 180 milligrams of nitrogen oxide per kilometer was clearly exceeded

What is not clear is what happens with any software update?? If it necessitates continually running the engines at lower temperature to keep NOx levels down then thermal efficiency and fuel economy may suffer???

Can it be read that the oil temperature warming was delayed for the duration of the test? (Then permitted to attain its final value when the test is completed).
If so, a further lengthening of the diesel's warm up period will not be well received by the public or the DPF.

 

[grober]

Can it be read that the oil temperature warming was delayed for the duration of the test? (Then permitted to attain its final value when the test is completed).
If so, a further lengthening of the diesel's warm up period will not be well received by the public or the DPF.

That's how I read it. The engine warm up period was extended for the duration of the test in order to pass ? I suspect the EGR may be involved as well.

 

[Bellow]

That's how I read it. The engine warm up period was extended for the duration of the test in order to pass ? I suspect the EGR may be involved as well.

Given that EGR is cooled, maybe that cooling is bypassed to keep coolant temp low - I can't otherwise imagine how ''desired coolant temperature control was active: it kept the coolant circuit artificially colder'' is achievable. Hot EGR though brings heat back into the chamber - promoting NOx formation - who knows?

If we are on track though, what a complete faff this test regime is if it concerns itself with only the engines warm up phase. Then again, some people who will do anything but walk and/or insist on needlessly starting a cold engine (out and back into the garage just to wash it) are maybe why it is structured this way. Get the laws we deserve and all that....

 

[rf065]

All hypothetical, I'm still not convinced that the first software updates due to emissions cheating would be carried out on a W204 model, I'm thinking the updates are entirely unconnected to this.

 

[reverend]

Do you know what version you went from and too at all please?

I had my E220 in to a specialist a month or so ago who said they'd updated the engine ECU and gearbox software and then took it into MB themselves for an update a couple of weeks ago to the COMAND unit.

When I went through online Xentry myself I had no updates available a couple of weeks ago, and this is what I currently have on a mid 2015 (MY2016) E220 as a baseline:



I've had my car remapped now from the above base so intrigued to hear about any changes since as guessing they'll apply to more.

 

[grober]

https://www.motor-talk.de/forum/aktion/Attachment.html?attachmentId=757224

PAGE 31 for EGR information which may or may not be pertinent to NOx levels --- it centres round whether the EGR cooler is used or by-passed to aid cylinder warm up on part load