Hello, I bought my E63S sedan new in 2023. After 3 months of ownership, I got a CEL for “boost pressure in turbo 1 and turbo 2 too high” (P023400 and P02CA00) codes as diagnosed by the dealer. The dealer noticed slow wastegate operation and diagnosed the root cause as a faulty boost pressure transducer (Y77/1, part # 000-153-18-00). They replaced the transducer along with a vacuum line.

About 6 months later, I started having intermittent power loss and no CEL. In S+, I had no boost, only about 375hp max with pedal to the floor. Turning the car off and on fixes it. Went back to the dealer, they couldn’t reproduce the issue nor find any codes and so didn't do anything.

After another 3 months, the issue became more frequent. It seems like it starts off very intermittent, and then slowly gets more frequent, similar to the second post on this thread. Still no CEL. I was up for yearly service, so I got videos of the issue and told them that it keeps happening. This time they dug deeper and checked the wastegate linkage, actuation, removed the airboxes and checked the turbine blades, and did a smoke test. They found no issues or visible leaks. They checked the "unfiltered codes" and there they found the same overpressure codes as before and diagnosed another faulty transducer – they vacuum tested it and found it slowly losing vacuum. They replaced the transducer again, without replacing any vacuum lines this time.

All has been well for 7 months. But yesterday, to my dismay, I got no boost when I floored the accelerator. Again no CEL, and again turning the car off and on fixes it. This is the 4th time in less than 2 years that I’ve started experiencing this issue.

Has anyone experienced something similar? Why does the transducer keep needing replacement? Is there something deeper in the engine causing this? I know exhaust valve issues have been reported with these cars, but as far as I can tell, the exhaust valves are operating normally. Does anyone have any other ideas before I reproduce this issue and show it to the dealer again? I really love this car, but it’s frustrating not to be able to trust having 100% power all the time as it rightfully should, especially when I can't pull over and restart it right away. I’m worried that something could be seriously wrong. Thanks in advance.

 

Another thing worth checking is the check valve. So check the check valve.

 

https://mbworld.org/forums/w212-amg/...ve-repair.html

 

Thanks! I’ll bring that up to them. It happened again last week and I went straight to the dealer while it was still in state to have their foreman ride along. He thinks something other than the transducer is the problem, but it would be hard to say without a code or CEL light being thrown.

He did also say they can escalate to AMG in Germany, but that even they may not be able to do much without a code. Love the car and want to hold onto it for now, but it sucks that the whole reason I spent so much and bought this car - the power - comes to a point where it cannot be reliably counted on to always be there when I need it.

 

All the best!

 

I have a feeling the 2023's were just thrown together haphazardly.

My transmission was toast, brand new, and threw zero codes. Dealer had to drop the pan and send my "it's not working" video and pics of debris to Germany to get a new one.
Like you, zero codes. Which is so weird on a car that logs every burp and fart.

Good luck - at least the foreman saw it first hand.

 

Did you ever get this resolved? My car is doing this more and more now, 0 boost. Not even just capped, when the car decides something is wrong flooring it just cuts all boost to zero, car is an NA car (SLOW!) and all I have to do is quickly turn the car off/on and the boost is back for 5 minutes.

 

Yeah. TLDR is this ended up being a warranty total engine replacement, lol.

MB directed my dealer to replace both my turbos at first, and when they removed them, they found that the passageway in the engine block that feeds oil to the turbos was not properly bored out from the factory, restricting the flow of oil. They also said that fragments of that improper boring were loose in the engine somewhere. So they proceeded with a full engine replacement. MB apparently told my dealer that they had seen "a handful" of this same defect.

Been a couple thousand miles and half a year now and all has been well with the new engine.

Good luck with yours, I hope you get it figured out! I think the first couple transducer repairs for my car were guided by this LI: https://static.nhtsa.gov/odi/tsbs/20...60741-9999.pdf

 

Thank you for the update!
I want to tune but not if stuff like your issue maybe lurking.

I wonder how to get them to check if the turbos and oil are fine.

Hmm.

 

All the best

 

One more question - how many kms did you have when they found the oil boss issue?
I was at the dealer today and mentioned it to them - they are going to see if they can check but if it's a lot of work checking Germany has to approve it. Their comment was if it was the same issue, it would have showed up well before 70,000kms. I'm not so sure though and want this looked at.

My original factory warranty expires in a few thousands kilometers before extended kicks in, and I kind of need them to fix this boosting issue especially if it's like yours re: oil bosses wrong in the block.

 

Update - my issue was fixed with a new intake diverter valve in warranty.
Time will tell but so far the repeatable problem is GONE!

 

Thanks for the update : )

 

Sorry for a very late reply, didn't get a notification for some reason. But my issue started within just a couple months of buying the car, around 2500 kms, and repeated itself every 6-7 months after they kept replacing the transducer, so at 70,000km+ you would've definitely known earlier if it was that issue.

Very happy to hear that you had the issue resolved under warranty! I'm coming up on a year since the engine replacement and haven't had the power loss since then either. Happy motoring to the both of us from here on out