2025 S63 E Performance--What Has Happened to MB Quality??
Thread Starter
MBWorld Fanatic!
Joined: Feb 2010
Posts: 1,519
Likes: 391
'25 S63 AMG E Performance, '26 CLE 53 AMG
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.
MBWorld Fanatic!
Joined: Oct 2002
Posts: 4,975
Likes: 1,343
From: Cincinnati
2010 E350 4Matic
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.
MBWorld God!
Joined: Dec 2019
Posts: 32,217
Likes: 6,275
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.
MBWorld God!
Joined: Dec 2019
Posts: 32,217
Likes: 6,275
MBWorld God!
Joined: Dec 2019
Posts: 32,217
Likes: 6,275
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.
MB World Stories
The Best of Mercedes & AMG
Manual Mercedes? 6 Times Sindelfingen Let Drivers Have All The Fun
Verdad Gallardo
Mercedes SLR McLaren 722 S Is Extremely Rare Example Modified by McLaren
Verdad Gallardo
8 Classic Boxy Mercedes Designs That Have Aged Like Fine Wine
Verdad Gallardo
Flawlessly Restored Mercedes 190E Evo II Heads to Auction
Verdad Gallardo
Electric Mercedes C-Class Unveiled: 11 Things You Need to Know
Verdad Gallardo
Mercedes EQS Gets A Major Update: Everything You Need to Know
Verdad Gallardo
5 Underrated Mercedes-Benz Models That Don't Get the Love They Deserve
Verdad Gallardo
Mercedes 300D Has Pushed Well Past 1 Million Miles and It Ain't Stopping
Verdad Gallardo
10 Most Reliable Mercedes-Benz Models You Can Buy Used
Verdad Gallardo
Senior Member
Joined: Apr 2025
Posts: 484
Likes: 203
From: Lowcountry, GA
'25 S580
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.
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!
MBWorld God!
Joined: Jul 2010
Posts: 31,273
Likes: 3,916
From: on my way
2012 CLS63
Well I have been a Mercedes Benz customer going back to my 1985 E300 and buying brand new S Class cars since about 2000. My best S Class it terms of quality and performance with virtually no issues was my '19 S63 that I just traded less than a week ago!
Now my brand new less than 100 miles (owned less than a week) 2025 S63 E Performance has a check engine light. I found out today that there going to need to disassemble half the car including removing the gas tank to replace 3 sensors tied to the Evap emissions system--and there not sure this will fix the problem. This will be alteast a three day job if not a week.
I have been a loyal MB person for years---WHAT THE HELL has happened to MB and MB quality? This is just unacceptable for a $240k MSRP S63.
Anyone else have issue with the emission sensors/Evap system on a W223?
Now my brand new less than 100 miles (owned less than a week) 2025 S63 E Performance has a check engine light. I found out today that there going to need to disassemble half the car including removing the gas tank to replace 3 sensors tied to the Evap emissions system--and there not sure this will fix the problem. This will be alteast a three day job if not a week.
I have been a loyal MB person for years---WHAT THE HELL has happened to MB and MB quality? This is just unacceptable for a $240k MSRP S63.
Anyone else have issue with the emission sensors/Evap system on a W223?
MBWorld God!
Joined: Dec 2019
Posts: 32,217
Likes: 6,275
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!
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!
Senior Member
Joined: Apr 2025
Posts: 484
Likes: 203
From: Lowcountry, GA
'25 S580
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.
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.
MBWorld God!
Joined: Dec 2019
Posts: 32,217
Likes: 6,275
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.
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.
MBWorld Fanatic!
Joined: Sep 2019
Posts: 3,104
Likes: 1,487
From: U.S.
Current/Last 5-years:GLS;G70;Alpina B8;X7;Accord. Sold:X7,TeslaS;S560;S550,X5;530e;L.Navigator;LS460
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.
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.
MBWorld God!
Joined: Dec 2019
Posts: 32,217
Likes: 6,275
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.
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.
As well as the "smart" alternator, it does seem on some models, the computer logic is flawed with that.
Thread Starter
MBWorld Fanatic!
Joined: Feb 2010
Posts: 1,519
Likes: 391
'25 S63 AMG E Performance, '26 CLE 53 AMG
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.
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.
MBWorld Fanatic!
Joined: Oct 2010
Posts: 8,120
Likes: 4,351
From: Corona Del Mar, CA
2019 SL450, 2019 E450 Luxury Trim Wagon, 2024 BMW I7 xDrive60
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.
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.
MBWorld Fanatic!
Joined: Oct 2010
Posts: 8,120
Likes: 4,351
From: Corona Del Mar, CA
2019 SL450, 2019 E450 Luxury Trim Wagon, 2024 BMW I7 xDrive60
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.
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.
Last edited by Streamliner; Jul 2, 2025 at 12:24 PM.
MBWorld Fanatic!
Joined: Oct 2002
Posts: 4,975
Likes: 1,343
From: Cincinnati
2010 E350 4Matic
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.
MBWorld Fanatic!
Joined: Jun 2015
Posts: 2,296
Likes: 1,481
23 S580 Executive
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.
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.
