C63s no boost problem
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Joined: Jun 2025
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C63s
C63s no boost problem
Recently, my 2019 stock C63s has been acting up in 2nd gear. Sometimes it won’t build boost and won’t push full power past 3k RPM, but other times it’s fine. 1st gear pulls normally with no issues. (there is no check engine light the car sounds and feels fine)
Has anyone else experienced this? Could it be related to needing a transmission flush, or might it be something else?
Has anyone else experienced this? Could it be related to needing a transmission flush, or might it be something else?
Last edited by C63sB; Aug 22, 2025 at 09:16 PM.
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Joined: Jun 2025
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C63s
Looks like there's no hidden error codes, i just got a oil change and a transmission flush and its still not pushing full power...
It sometimes does and sometimes it doesn't no boost
I think there might be a really small boost leak
Anyone have this issue before??
It sometimes does and sometimes it doesn't no boost
I think there might be a really small boost leak
Anyone have this issue before??
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Joined: Mar 2007
Posts: 148
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Recently, my 2019 stock C63s has been acting up in 2nd gear. Sometimes it won’t build boost and won’t push full power past 3k RPM, but other times it’s fine. 1st gear pulls normally with no issues. (there is no check engine light the car sounds and feels fine)
Has anyone else experienced this? Could it be related to needing a transmission flush, or might it be something else?
Has anyone else experienced this? Could it be related to needing a transmission flush, or might it be something else?
Thread Starter
Newbie
Joined: Jun 2025
Posts: 13
Likes: 0
C63s
yeah i have no idea what's going on with this car, just took it out tonight weather is cold nice boost weather and the car was pulling nice with no issues lol
Like i said sometimes its fine sometimes it just drives with no boost/power after shifting gears
Like i said sometimes its fine sometimes it just drives with no boost/power after shifting gears
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Joined: Mar 2019
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From: NYC area
2019 C63S Coupe
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Thread Starter
Newbie
Joined: Jun 2025
Posts: 13
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C63s
Yup used a better tool to read codes and it gave me a MAF sensor , i think that's what's causing the car not to push power
Gonna clean that sensor and hopefully problem is fixed
Gonna clean that sensor and hopefully problem is fixed
Last edited by C63sB; Aug 29, 2025 at 07:29 PM.
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