Did the dealer just give me the wrong spark plugs?
Thread Starter
Junior Member
Joined: May 2024
Posts: 20
Likes: 3
c63s
Did the dealer just give me the wrong spark plugs?
I got these spark plugs for my C63s from the dealer, and I told the parts guy my cars vin number and everything and when I googled the part number on these plugs many websites said these are not the ones for my car while the parts guy insisted that they the correct ones. so I’m a bit confused right now. Would these work on the M177 or should I return them?
Last edited by MBEnt63; Jun 29, 2025 at 09:13 PM. Reason: wrong image
MBWorld Fanatic!
Joined: Sep 2016
Posts: 1,718
Likes: 608
From: Australia
⏱️ 700HP Facelift converted C63 S Coupe with Drexler 3.06 plated LSD
I got these spark plugs for my C63s from the dealer, and I told the parts guy my cars vin number and everything and when I googled the part number on these plugs many websites said these are not the ones for my car while the parts guy insisted that they the correct ones. so I’m a bit confused right now. Would these work on the M177 or should I return them?
Super Member
Joined: Mar 2019
Posts: 595
Likes: 96
From: NYC area
2019 C63S Coupe
I got these spark plugs for my C63s from the dealer, and I told the parts guy my cars vin number and everything and when I googled the part number on these plugs many websites said these are not the ones for my car while the parts guy insisted that they the correct ones. so I’m a bit confused right now. Would these work on the M177 or should I return them?
Also note photo below for reference
Thread Starter
Junior Member
Joined: May 2024
Posts: 20
Likes: 3
c63s
uhh the mechanic installed them, but I still had my doubts. The dealer parts guy did say if they were the wrong ones I could return them even if I installed em so hopefully they will accept it lol.
Trending Topics
MBWorld Fanatic!
Joined: Sep 2016
Posts: 1,718
Likes: 608
From: Australia
⏱️ 700HP Facelift converted C63 S Coupe with Drexler 3.06 plated LSD
Our cars are sensitive with the plugs and wrong ones will cause problems. Not trying to stress you but having the wrong plugs can create a lot of issues including damage to the engine as noted here. So get those plugs out and put new ones in asap.
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
MBWorld Fanatic!
Joined: Sep 2016
Posts: 1,718
Likes: 608
From: Australia
⏱️ 700HP Facelift converted C63 S Coupe with Drexler 3.06 plated LSD
Your car will be fine, please let us know how it goes 🤝
MBWorld Fanatic!
Joined: Jun 2021
Posts: 3,110
Likes: 1,346
From: Fleriduh
W212 E63S Wagon - GSL580 - E63 - E350 - C300
MBWorld Fanatic!
Joined: Jun 2015
Posts: 9,062
Likes: 4,565
From: Maryland
2024 S580
That would never happen at the dealership@SW20S goes to 😉😉😉😉
Thread Starter
Junior Member
Joined: May 2024
Posts: 20
Likes: 3
c63s
Yeah either their program is faulty or something cause they kept on checking these plugs compatibility with my vin number and their system kept on saying it's compatible. I wasn't bothered with that so the parts guy just replaced them for me and apologised lol.
Out Of Control!!
Joined: Apr 2019
Posts: 11,924
Likes: 6,776
From: Silicon Valley
W212 MY'14 M276-3.5NA @75kMi
MISFIRES IGNITION TUNED-UP
Does this come with laggy throttle, right?
I think your ECU may well be enforcing lean penalties.
Go ahead and simply "clear faults", this will restart normal cylinders fuel spraying. Good until ECU relearns same penalties.
Keep us posted on progress to solve this.
Last edited by CaliBenzDriver; Jun 30, 2025 at 09:11 PM.
Thread Starter
Junior Member
Joined: May 2024
Posts: 20
Likes: 3
c63s
Your all-new ignition tune-up did not prevent misfirings... you're not alone.
Does this come with laggy throttle, right?
I think your ECU may well be enforcing lean penalties.
Go ahead and simply "clear faults", this will restart normal cylinders fuel spraying. Good until ECU relearns same penalties.
Keep us posted on progress to solve this.
Does this come with laggy throttle, right?
I think your ECU may well be enforcing lean penalties.
Go ahead and simply "clear faults", this will restart normal cylinders fuel spraying. Good until ECU relearns same penalties.
Keep us posted on progress to solve this.
Out Of Control!!
Joined: Apr 2019
Posts: 11,924
Likes: 6,776
From: Silicon Valley
W212 MY'14 M276-3.5NA @75kMi
First thing was I replaced the plugs, drove the car for less than 0.1 Km’s and the CEL came back so it instantly went back to the garage and the mechanic said coils were the issue. I got that today and my mechanic will replace them tomorrow since he was quite busy with other cars today. I’m in the Middle East and I heard in USA they replace those coils for free, sadly that’s not the case here. I will update you guys tomorrow when the new plugs and coils are installed!
Thread Starter
Junior Member
Joined: May 2024
Posts: 20
Likes: 3
c63s
I got a “slightly” used coil since a new one isn’t available and I have strong feeling this used coil is faulty, I took it to an actual Mercedes specialist and he’ll check my car using xentry and check everything else. Hopefully it’ll go well. Will update you guys asap
Out Of Control!!
Joined: Apr 2019
Posts: 11,924
Likes: 6,776
From: Silicon Valley
W212 MY'14 M276-3.5NA @75kMi
WEAK CYLINDERS COMPRESSIONS
sad update, changed plugs and coils, CYL8 misfire is still there I got a “slightly” used coil since a new one isn’t available and I have strong feeling this used coil is faulty, I took it to an actual Mercedes specialist and he’ll check my car using xentry and check everything else. Hopefully it’ll go well. Will update you guys asap
I got a “slightly” used coil since a new one isn’t available and I have strong feeling this used coil is faulty, I took it to an actual Mercedes specialist and he’ll check my car using xentry and check everything else. Hopefully it’ll go well. Will update you guys asap - (leaky valves)
- (bore score)
- #1: carboned rings!
Ask for a relative compression test BEFORE replacing any of the pricey injectors. It will show a weak Cyl.8 plus a few marginal cylinders.
Then visual inspection to confirm how pistons crown look washed off.
Last edited by CaliBenzDriver; Jul 2, 2025 at 12:06 PM.
Thread Starter
Junior Member
Joined: May 2024
Posts: 20
Likes: 3
c63s
All good ignition still misfire... this is now inching its way towards leaky cylinder contribution:
Ask for a relative compression test BEFORE replacing any of the pricey injectors. It will show a weak Cyl.8 plus a few marginal cylinders.
Then visual inspection to confirm how pistons crown look washed off.
- (leaky valves)
- (bore score)
- #1: carboned rings!
Ask for a relative compression test BEFORE replacing any of the pricey injectors. It will show a weak Cyl.8 plus a few marginal cylinders.
Then visual inspection to confirm how pistons crown look washed off.
MBWorld Fanatic!
Joined: Feb 2017
Posts: 2,297
Likes: 1,205
From: Baltimore County, MD
'13 s212 63 p30. '06 LX470
is that really the case? The cars done 30K miles only and I just serviced it 1000 Km’s ago, it was running very smooth, the old plugs didn’t seem worn out badly so I feel like the coil is still the issue, I’ll look at what the diagnosis says and hopefully it’s not the engine cause I barely drive this car and it’s my joyride car
MBWorld Fanatic!
Joined: Jun 2021
Posts: 3,110
Likes: 1,346
From: Fleriduh
W212 E63S Wagon - GSL580 - E63 - E350 - C300
is that really the case? The cars done 30K miles only and I just serviced it 1000 Km’s ago, it was running very smooth, the old plugs didn’t seem worn out badly so I feel like the coil is still the issue, I’ll look at what the diagnosis says and hopefully it’s not the engine cause I barely drive this car and it’s my joyride car
Wait, have you tried a NEW coil yet? I mean, not to be a dick, but - if you can not afford a coil at any given moment...this may not be the right car for you. I keep three new coils in my garage at all times (I have three MB V8 cars that use the same coils).
Thread Starter
Junior Member
Joined: May 2024
Posts: 20
Likes: 3
c63s
My guy if you could read I did write new coils weren’t available where I live and they’re on back order. the parts guy here in the dealer doesn’t know **** about AMG’s I’m convinced they have new ones and he doesn’t know it. I bought a used one from a friend and I will order a new one online in case if it’s coils that are causing the issue. Have a good day 😁
