S-Class (W222) 2014-2020

CEL and major engine misfiring. right side engine bank affected

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Old 04-10-2021, 07:49 PM
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CEL and major engine misfiring. right side engine bank affected

CEL and major engine misfire, dealer has car and says right side engine misfiringQuote:
Originally Posted by konigstiger View Post
May very well be bulletin 068795 if engine is within affected range.

2019 S 560 under 14K miles. all of a sudden started misfiring and CEL came on, at times blinking. car would stop many times. in neutral engine revs ok, when put on D, and accelerate the misfire would start. of course it kept getting worse and had it towed to MB of Grapevine. the dealer had the car for 4 days now and said they will have to run a battery of test as per factory recommendation. will know something by Tuesday. I really take care of my car and drive carefully. so very surprised when this happened. looking at the TSB, it sounds like a major issue.
Any input om my issue appreciated.
Old 04-11-2021, 08:47 AM
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A lot of us get a steady CEL and do not get too excited. Read the code(s), reset the light, repeat. But, aflashing CEL indicates a severe problem, one that requires immediate car repair. In other words, if your check engine light is flashing, pull over and call a tow service.
Old 04-11-2021, 11:25 AM
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Originally Posted by RajwanyS550
CEL and major engine misfire, dealer has car and says right side engine misfiringQuote:
Originally Posted by konigstiger View Post
May very well be bulletin 068795 if engine is within affected range.

2019 S 560 under 14K miles. all of a sudden started misfiring and CEL came on, at times blinking. car would stop many times. in neutral engine revs ok, when put on D, and accelerate the misfire would start. of course it kept getting worse and had it towed to MB of Grapevine. the dealer had the car for 4 days now and said they will have to run a battery of test as per factory recommendation. will know something by Tuesday. I really take care of my car and drive carefully. so very surprised when this happened. looking at the TSB, it sounds like a major issue.
Any input om my issue appreciated.
So what is Mercedes doing about the engines that are in the affected range but haven't had a major engine failure yet? Is this a ticking time bomb for them should they make it out of the warranty period?

Last edited by MBNUT1; 04-11-2021 at 11:33 AM.
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Old 04-11-2021, 11:26 AM
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Old 04-11-2021, 02:38 PM
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My guess would be a bad Coil, My car had that around 9K miles before I owned it in reading the service history. But could be anything, I'm sure with issue like that the dealer should find the issue pretty quickly one would think.
Old 04-13-2021, 12:14 PM
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Runnibg diagnostics

Originally Posted by MBNUT1
So what is Mercedes doing about the engines that are in the affected range but haven't had a major engine failure yet? Is this a ticking time bomb for them should they make it out of the warranty period?
they are still running diagnostics on the car. So far the fuel system is good so obviously they are gonna look at the engine next. Take pics of cylinders and pistons. Very scary stuff. Car with only 13 k miles. The car never showed any problem before this. Will let you all know about the progress.
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Old 04-13-2021, 01:21 PM
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Originally Posted by RajwanyS550
they are still running diagnostics on the car. So far the fuel system is good so obviously they are gonna look at the engine next. Take pics of cylinders and pistons. Very scary stuff. Car with only 13 k miles. The car never showed any problem before this. Will let you all know about the progress.
Thank you for your reply. Awaiting your learnings

Last edited by MBNUT1; 04-13-2021 at 01:28 PM.
Old 04-14-2021, 05:08 PM
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Low fuel pressure pump

Now they think it might be low fuel pressure pump. They will install it hopefully today and let me know. Fingers crossed
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