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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 > 3 code after JB4 removal, HELP



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      07-31-2015, 03:14 AM   #1
Harrychiu012
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3 code after JB4 removal, HELP

After the jb4 was removed by a friend couple days ago, I attempted to put it back but couldn't get it to work, car started and was throwing code. I decided to wait until my friend can reinstall it for me. In the meantime everything was put back to stock, but now when I use the BT cable to scan for fault code and shadow code, 3 shows up but no CEL:

2C3C- lambda probe in front of catalytic converter 2 not plugged
2A2C- fuel mixture control 2
2C78- lambda probe behind catalytic converter signal

Do you know if it was reinstalled properly? Or if it is not seated properly? I tried disconnecting and reconnecting everything several times.
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      07-31-2015, 04:16 AM   #2
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You got catless downpipes ? If so there's your issue
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      07-31-2015, 05:16 AM   #3
Harrychiu012
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Yeah, I have catless downpipe, but when i had jb4 installed, it was not there.
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      07-31-2015, 05:33 AM   #4
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Are the codes active? In the BT scan it will sometimes show the code but say not present at this time. The JB4 can auto clear codes.
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      07-31-2015, 05:44 AM   #5
Harrychiu012
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When i had the JB4 on, it will throw code for Catles downpipe detected and CEL would come on, i always just clear them. But never these codes.
Maybe what you guys saying is true. But at the same time, I've scanned code with the JB4 and catless DP on, and i've never seen these either. Only now when i've removed jb4.. so i am hoping it is not because of i messed something up in the DME.
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      07-31-2015, 05:58 AM   #6
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Quote:
Originally Posted by Harrychiu012 View Post
When i had the JB4 on, it will throw code for Catles downpipe detected and CEL would come on, i always just clear them. But never these codes.
Maybe what you guys saying is true. But at the same time, I've scanned code with the JB4 and catless DP on, and i've never seen these either. Only now when i've removed jb4.. so i am hoping it is not because of i messed something up in the DME.
Did you run any ethanol? That can cause a mixture code.
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      07-31-2015, 09:56 AM   #7
Mike@N54Tuning.com
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Quote:
Originally Posted by Harrychiu012 View Post
Yeah, I have catless downpipe, but when i had jb4 installed, it was not there.
The JB4 was removing the codes for you. Now without it you have the codes, which are associated with catless downpipes.

Mike
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      07-31-2015, 10:01 AM   #8
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Quote:
Originally Posted by Mike@N54Tuning.com View Post
The JB4 was removing the codes for you. Now without it you have the codes, which are associated with catless downpipes.

Mike
+1 You'll have those codes until you either put catted downpipes back on or reinstall the JB4 or a flash tune with those codes toggled off.
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