Hesitation Under Full Throttle

mrleba18 · 08-14-2018, 08:23 AM

As of yesterday, my car started doing some weird stuff.
2012 335i, E92, N55, 88K Miles
While in 3rd, 4th, 5th, or 6th gear, starting at about 2000 RPM, when go to WOT from 2000 RPM,by the time I reach 2500 RPM, I get a major hesitation which feels like its coming from the transmission but I am not convinced that is the root cause of the issue. I have a stage 1 aggressive tune on it from my Cobb Accessport. Through the Accessport I am throwing a "P2CF4" and a "P2FAC" code, but no check engine light has turned on. I can find very little as to what these codes actually mean. Can anybody provide any insight into the issue?

Thanks!

Bimmer_Engineer · 08-14-2018, 08:32 AM

This post says P2CF4 is O2 sensor...

https://www.e90post.com/forums/showthread.php?t=1076920

This one says P2FAC is a misfire...

https://www.e90post.com/forums/showt...php?p=22496077

mrleba18 · 08-14-2018, 10:39 AM

Thanks! My gut feel is that I should start with spark plugs, and see where that gets me. I just did coils and plugs at 50K though...

08-14-2018, 08:23 AM	#1
mrleba18 New Member 0 Rep 8 Posts Drives: 2012 335i Coupe Join Date: Jan 2017 Location: MN iTrader: (0)	Hesitation Under Full Throttle As of yesterday, my car started doing some weird stuff. 2012 335i, E92, N55, 88K Miles While in 3rd, 4th, 5th, or 6th gear, starting at about 2000 RPM, when go to WOT from 2000 RPM,by the time I reach 2500 RPM, I get a major hesitation which feels like its coming from the transmission but I am not convinced that is the root cause of the issue. I have a stage 1 aggressive tune on it from my Cobb Accessport. Through the Accessport I am throwing a "P2CF4" and a "P2FAC" code, but no check engine light has turned on. I can find very little as to what these codes actually mean. Can anybody provide any insight into the issue? Thanks!
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08-14-2018, 08:32 AM	#2
Bimmer_Engineer Lieutenant Colonel 1044 Rep 1,667 Posts Drives: 2007 335i Join Date: May 2018 Location: Louisiana iTrader: (0) Garage List 2008 Porsche Boxster [0.00] 2016 Mercedes Benz ... [0.00] 2007 BMW 335i [9.50]	This post says P2CF4 is O2 sensor... https://www.e90post.com/forums/showthread.php?t=1076920 This one says P2FAC is a misfire... https://www.e90post.com/forums/showt...php?p=22496077
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08-14-2018, 10:39 AM	#3
mrleba18 New Member 0 Rep 8 Posts Drives: 2012 335i Coupe Join Date: Jan 2017 Location: MN iTrader: (0)	Thanks! My gut feel is that I should start with spark plugs, and see where that gets me. I just did coils and plugs at 50K though...
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