Extended Warranty M157 & M278 Cylinder Head
Newbie
Joined: Jun 2021
Posts: 12
Likes: 6
C207 E550 2012
MB Miami told me today that the car needs to have an MIL for 0430 and 0420 Catalyst system efficiency below threshold.
If the MIL is about fuel trims due to restricted cats on their way out, they won’t cover them even though we are talking about the same part being faulty.
I contacted MBUSA and they didn’t know anything about specific codes.
Thanks in advance.
Newbie
Joined: Jul 2018
Posts: 6
Likes: 0
From: Vancouver B.C.
GL550 - 2015
M278
Yes they have been improved, the coating has improved and also the quality inspection of the faulty presses at the MB engine Factories have improved.
Besides the liner coating, the biggest issue was that the presses who produced the cylinder heads where faulty pressing the valve seats into the cylinder head.
From 2016 the engines have improved.
I had a late 2014 2015 model, and shortly after my M278 MB figured that they had issues, but it took them a while as also the AMG M278 version was impacted.
I have a new M278 under the extended warranty, it drives like a dream!
Besides the liner coating, the biggest issue was that the presses who produced the cylinder heads where faulty pressing the valve seats into the cylinder head.
From 2016 the engines have improved.
I had a late 2014 2015 model, and shortly after my M278 MB figured that they had issues, but it took them a while as also the AMG M278 version was impacted.
I have a new M278 under the extended warranty, it drives like a dream!
Out Of Control!!
Joined: Jun 2004
Posts: 13,799
Likes: 3,229
2014 E63S; AMS 100 octane ECU dyno tune; EDOK TCU tune; BB intakes; sprintbooster
Out Of Control!!
Joined: Jun 2004
Posts: 13,799
Likes: 3,229
2014 E63S; AMS 100 octane ECU dyno tune; EDOK TCU tune; BB intakes; sprintbooster
Yes they have been improved, the coating has improved and also the quality inspection of the faulty presses at the MB engine Factories have improved.
Besides the liner coating, the biggest issue was that the presses who produced the cylinder heads where faulty pressing the valve seats into the cylinder head.
From 2016 the engines have improved.
I had a late 2014 2015 model, and shortly after my M278 MB figured that they had issues, but it took them a while as also the AMG M278 version was impacted.
I have a new M278 under the extended warranty, it drives like a dream!
Besides the liner coating, the biggest issue was that the presses who produced the cylinder heads where faulty pressing the valve seats into the cylinder head.
From 2016 the engines have improved.
I had a late 2014 2015 model, and shortly after my M278 MB figured that they had issues, but it took them a while as also the AMG M278 version was impacted.
I have a new M278 under the extended warranty, it drives like a dream!
Out Of Control!!
Joined: Jun 2004
Posts: 13,799
Likes: 3,229
2014 E63S; AMS 100 octane ECU dyno tune; EDOK TCU tune; BB intakes; sprintbooster
doesn't speak to the new changes in m278 manufacturing to improve quality. Looks identical to the letter I received a year ago
do you have any documentation that speaks to the changes you state that were made to the m278 subsequent to these issues being identified?
are you presuming it has improved since 2016 is the last year that is covered in this campaign?
do you have any documentation that speaks to the changes you state that were made to the m278 subsequent to these issues being identified?
are you presuming it has improved since 2016 is the last year that is covered in this campaign?
Last edited by PeterUbers; May 25, 2024 at 12:29 AM.
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From: In my garage
E55, GLS450, GL63, GLE350
It's so rare for MB to change anything in production until the model line is complete. They seemingly would rather design a new engine than fix one in production. Also, I'd imagine there is liability to admitting any manufacturing defect. I doubt that you will find an official article that admits a defect or a change to fix said defect since it could be used in court against them at a later date. They are very careful to avoid admitting fault, taking responsibility for defects, and will fight recalls with every ounce of their being since it all costs money and they are in the business to make it and not give it back.
