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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N54 Turbo Engine / Drivetrain / Exhaust Modifications - 335i > Catless Downpipes Getting Codes Now



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      10-12-2014, 07:17 PM   #1
Humann
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Catless Downpipes Getting Codes Now

Just throwing my problem out there..

Have stock downpipes on and everything is running perfect with Cobb stage 1

Put catless downpipes on and now im getting misfire codes and its spuddering and it tries to die at idle sometimes - stage 2 of course

AP reads
P0040: Upstream Oxygen Sensors Swapped From Bank to Bank
P2C24: Lambda probe before catalyst reversed
P29D0,1,2: Misfire in 4,5, and 6

Was told sensors might need to be swapped but just looking to see if anyone else had this happen.

Disclaimer: Didn't have the tools or stands to do it on my own. Had my exhaust guy do it.
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      10-12-2014, 07:38 PM   #2
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Confirm sensors are in the correct ports. This seems to happen when they're swapped by accident based on what I see from others.
Quick search yielded this
http://www.e90post.com/forums/showthread.php?t=598547
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      10-12-2014, 07:47 PM   #3
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Quote:
Originally Posted by 335NJ View Post
Confirm sensors are in the correct ports. This seems to happen when they're swapped by accident based on what I see from others.
Quick search yielded this
http://www.e90post.com/forums/showthread.php?t=598547
Alright that's good to know. I'm hoping it's just needing to switch them around and nothing crazy.

Was trying to google search it, why I didn't fine that thread. Thanks!
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      10-12-2014, 08:56 PM   #4
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Quote:
Originally Posted by Humann View Post
Alright that's good to know. I'm hoping it's just needing to switch them around and nothing crazy.

Was trying to google search it, why I didn't fine that thread. Thanks!
Search within e90post. Up top in the main toolbar is the search drop-down.
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      10-12-2014, 10:52 PM   #5
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Gray wires on the short pipe, black wires on the long pipe
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      10-12-2014, 10:59 PM   #6
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Originally Posted by Tiago@VRSF View Post
Gray wires on the short pipe, black wires on the long pipe
He was closed today because you know Sunday and all.

Will be checking them early in the morning and ill update just so we know whats going on.

Oh yeah VRSF V2 DPs btw. Fitment was good and install went well.
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