What does the EVAP system and fuel sensor have to do with hybrid tech? It is the same system as my '19 S63 as I understand it. My problem (atleast the dealer speculation from discussion with MB and AMG) is that they have a bad batch of sensors that may impact all S Class cars in the US with the EVAP system.

 

Is the EVAP system common to all S classes? It sounds as if it should be.And is this bad sensor thing something we should be looking for?

 

Nothing other than it serves as a platform for some members to whine about technology that they don't like.

 

It absolutely may be different. Hybrids have pressurized fuel tanks that regular ICE cars don't have.

 

I was specifically talking about the E Performance drivetrain, sorry for the confusion.

 

Don't get me wrong, I am mainly concerned of how complicated the system it is, it is good when it works.

 

When it doesn't work however, it takes a long time and lots of effort to diagnose, the dealership technicians actually have no clue how to fix it and to work with Germany when Germany sometimes don't know how to fix it is quite annoying as well. Thankfully lemon law exists but what about the time spent, for some, time is money.

 

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You really can't blame the technicians working on the car, though.
Everything is made into a 'module' level nowadays which makes troubleshooting an issue very difficult.
One DTC could mean a dozen different failure modes.
Manually checking each possible causes take way too much time.
It's really counterproductive to try to identify the real cause, they'd rather have the technician replace one part after another based on the probability of the failures.
The improvement activities are assigned to the relevant plants or suppliers after so many claims.

So in real life, causing a scene or even pursuing the buyback process often times make a difference in how the issues are handled from the corporate side.
So everyone who has had premature failures or issues with their S, speak up!

 

Mother of Odin! I'd be so GD angry! I really hope this gets resolved, and does not cause more issue in the near future. Hang in there!

 

wrong thread...

 

If it is a safety issue, always report it to the NHTSA.

 

There's a team that evaluates any field issues to see if it's safety related.
If the issue can render the vehicle immobile while being driven it basically is a safety issue.
And it's MUCH cheaper to do a voluntary recall than getting slapped with fines from the NHTSA.
Takata airbag saga is the prime example.

 

Yes, I understand but I was thinking if it is indeed a safety issue reporting to the NHTSA might not be a bad idea.

 

I have a 2024 S63, and fortunately, I have not had this issue. However, I do agree that the quality of MB has declined over the years.

 

Interesting note/discussion about the EVAP system. As a matter of fact, My Lincoln Navigator, my X5, and now my GLS all needed the EVAP purge valve/sensor to be replaced. It is a 5-minute job for my GLS as the EVAP purge valve/sensor is right at the top of the engine by the air-filter.

I also found that in 2025 Mbenz had issues a new part number for the EVAP sensor, which is the one I am installed in my GLS. Sounds like they were aware of the issue and finally come up with a new/replacement part number at least for the GLS. No symptoms or check engine light even, it was just a ticking sound that was directly coming from that valve that I noticed mostly in the garage or closed spaces.

All these emissions related systems, as well as auto-stop/start are making these cars more complicated than they need to be in exchange for lower emission ratings that regulations are enforcing on car manufacturers. It's just silly and shouldn't be this way. The sector that should be regulated is the industrial sector, and that would make much more impact on emissions than forcing all of us to deal with excessive wear and tear systems on our cars for minimal impact on emissions.

 

When it comes to complex systems, I want to add: and the complex and unnecessary two-stage oil pump solenoid as well.

As well as the "smart" alternator, it does seem on some models, the computer logic is flawed with that.

 

OP Update: FINALLY, got the car back today!

I have no idea the warranty cost to MB but I am guessing $10k-20k (guessing close to the high end of the range) based on all the things that had to be removed and reinstalled just to replace some fuel pressure sensors. THIS CAR IS EXTEMEMELY COMPLICATED. It took 2.5 days just to get the alignment back into spec after removing the rear axel since they had to also remove the gas tank. The ride height adjustment with caster/camber adjustment took 2.5 shop days alone. Well after owning the car for 5 weeks now and the majority of the time being in the shop I can now hopefully enjoy my very complicated piece of machinery known as the S63 E Performance.

 

Glad you got it back and hope that the rest of your ownership will be trouble free with only happy motoring experiences.

 

Reminds me of my 1965 Jaguar XKE: To replace the clutch--something that could almost be called a regular maintenance item--it was necessary to pull the ENGINE & TRANSMISSION out of the car! The Germans have always been known for superior engineering (the British not so much) and prior to perhaps the W223, mechanics ENJOYED working on MB's. Today, I'm getting the idea that they probably hate it. Why they felt the need to build the new S63 with an electric drive boost is just beyond me.

 

Glad its back! Put this behind you and enjoy the car!

 

This is an interesting comment in that I remember years ago my Dad explaining how much more complicated Jaguar's approach to their rear end design was compared to Mercedes.

 

All's well that ends well

 

Mrs Crab 1.0 had a couple VW Bugs back in the day, I remember thinking many times that the engineers should be hung. Then shot. Then hung again, just to be sure. It's been 50 years now and some of it has faded in memory, but, the earlier Bug had a generator, the second, an alternator. Both were problems. With the second, the problems weren't bigger, but the alternator was, and you had to drop the engine to get it out. I recall using strong language when I figured that out. At least the heater/defroster was only terrible in the 12v, the 6v before was almost not functional, unless you were at speed. Probably few now remember that you used to always see them with the windows rolled down. It wasn't a lifestyle choice, it was the only was to keep the windshield clear in town.

As I recall, those were German cars. Meanwhile, the Triumph I brought into the relationship was as reliable as rain. No really... If it could break, it did. If it couldn't break, it still broke anyway. Those were the days. Sorry to drag that out, Stream talking about his Jag brought it to mind.

 

Enjoy the car and give us updates on how it rides. The S63 is awesome.