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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N55 Turbo Engine Tuning and Exhaust Modifications - 335i Tuning > Anybody know what this n55 fault code is?



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      07-26-2014, 03:02 AM   #1
e92proper
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got a fault code today on my 11 e92 335 w cobb APV-3, CP and bmw exhaust. code is P2CF4. running 93 octane and Stage 1 aggressive. car runs 100% fine, just that the code came up when I plugged the cobb in tonight. thought it was o2 sensor, but can't find it in any n55 fault code lists

Thanks for the help guys!!
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      07-26-2014, 04:12 PM   #2
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anybody?
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      07-26-2014, 05:15 PM   #3
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"Oxygen sensor before catalytic converter, dynamics. Slow response."

N55 Fault code list can be found here:

http://www.e90post.com/forums/showpo...64&postcount=1

Take off the "P" from the code and search for the remaining 4 characters (i.e., in your case, search the document for 2CF4.
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      07-26-2014, 05:46 PM   #4
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Awesome thanks! Tried looking through the 30 or so pages on PDF last night and couldn't find it! Appreciate the help.

I hear this is common with COBB tunes? Any clue? I cleared it, refilled on 93 octane and went out to test with some hard ass pulls and highway cruising. No codes. Odd
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      07-26-2014, 05:51 PM   #5
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Quote:
Originally Posted by e92proper View Post
Awesome thanks! Tried looking through the 30 or so pages on PDF last night and couldn't find it! Appreciate the help.

I hear this is common with COBB tunes? Any clue? I cleared it, refilled on 93 octane and went out to test with some hard ass pulls and highway cruising. No codes. Odd
I ran Cobb aggressive for many months without seeing that code. Had some others, but not that one.
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      07-26-2014, 08:33 PM   #6
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Another n55 owner I know suggested fuel. I gotta stop getting 93 at shit stations!! Lol
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      08-03-2014, 08:25 PM   #7
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This is from that PDF file sense you suffer from attention deficit.
0x2CF4
11508
dynamics: Slow response
catalytic converter.The diagnostic function monitors correct
P0133
Sensor 1)
Oxygen Sensor, Front
Slow Response
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      12-30-2014, 09:51 PM   #8
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what was outcome with this code??
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      12-31-2014, 06:36 AM   #9
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Nothing ever again, it cleared and. Never came back
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      12-31-2014, 01:29 PM   #10
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I just installed a BERK 4in Catless Downpipe and went to Stage 2 on my Cobb and P2cf4 has come up twice for me. Doesn't seem to have any negative effect at the moment.
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      12-31-2014, 03:06 PM   #11
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Quote:
Originally Posted by mike5809
I just installed a BERK 4in Catless Downpipe and went to Stage 2 on my Cobb and P2cf4 has come up twice for me. Doesn't seem to have any negative effect at the moment.
02 sensor??
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      01-01-2015, 11:47 PM   #12
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Quote:
Originally Posted by e92proper View Post
02 sensor??
I assume. I did get a few other codes, which I think were O2 or cat related. I cleared them and nothing came back, except the p2cf4 - which keeps coming back
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      01-02-2015, 12:05 PM   #13
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Quote:
Originally Posted by mike5809
Quote:
Originally Posted by e92proper View Post
02 sensor??
I assume. I did get a few other codes, which I think were O2 or cat related. I cleared them and nothing came back, except the p2cf4 - which keeps coming back
I'm thinking that's a misread in flow between the two sensors maybe??
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