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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 > Should I be concerned? 2013 N55 335i Codes



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      03-30-2015, 01:47 PM   #1
AJN55
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Should I be concerned? 2013 N55 335i Codes

As far as I know I do not have any issues but I have been thinking, Shouldn't my car be throwing a code?

Background:

I have a 2013 N55 335i xdrive Coupe. Current Mods are, BMS intake, JB4 G5 stage 2, ER Charge Pipe, VRSF Down pipe with Cyba tips and golf tee mod.

I have been seeing numerous forum posts about people having a CEL or similar type code when running a catless down pipe. There are also posts and products for a "down pipe fix".

My question is, with my catless down pipe and Golf tee mod shouldn't I be throwing at least 1 code? I use my JB4 to read & delete codes but every time i try to read them it says "No Codes Returned". Now, Trust me when I say this is a good thing, but now I am concerned thinking I should be throwing some sort of code. Is this unusual to have a catless down pipe not throwing any codes? Or maybe my JB4 isn't reading codes correctly???

Anyone with any input similar situations?

Thanks in advanced!
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      03-30-2015, 02:32 PM   #2
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If auto clear is enabled then no, it's not going to throw any codes for the DP. The JB4 automatically hides the CEL.
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      03-30-2015, 02:34 PM   #3
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With a catless downpipe installed your car will throw a post-cat code. However when you run a scan (true for COBB/JB4) the code will not show up as the tune will block that code out.

If you run a scan and do show any codes (such as a pre-cat o2 fault) then you probably have an issue.
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      03-30-2015, 02:36 PM   #4
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Thanks guys for the quick reply!! I'm going to check if I have auto cleared enabled otherwise I think i'm good.

Much Appreciated!!
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      03-30-2015, 02:37 PM   #5
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You can also turn off auto clear if not seeing the code bothers you.
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