[e92proper]

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!!

[e92proper]

anybody?

[trk411]

"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.

[e92proper]

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

[trk411]

Originally Posted by e92proper

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.

[e92proper]

Another n55 owner I know suggested fuel. I gotta stop getting 93 at shit stations!! Lol

[DesertBMW]

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

[Alpine335X]

what was outcome with this code??

[e92proper]

Nothing ever again, it cleared and. Never came back

[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.

[e92proper]

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??

[mike5809]

Originally Posted by e92proper

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

[e92proper]

Originally Posted by mike5809

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??

[Gunner_27]

Originally Posted by mike5809

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

brining this thread back to line, were you able to figure out what was causing that P2CF4 code ? just got it today, have had a catless dp for a while with cobb

[mike5809]

Originally Posted by Gunner_27

brining this thread back to line, were you able to figure out what was causing that P2CF4 code ? just got it today, have had a catless dp for a while with cobb

I sold the car a while ago but from what I remember I replaced both o2s, reinstalled the cobb, changed maps, went off e85, etc. - the code kept coming back. The only thing that worked was to remove the downpipe ... after I did that I never got the code again.