CATLESS to STOCK?!?!

mrkhanna16 · 01-28-2014, 11:12 PM

I went from a fully catless setup that threw a check engine light code to stock and the check engine light code has not gone away? Help?

Mit_Boost · 01-28-2014, 11:12 PM

Have you read the fault codes?

mrkhanna16 · 01-28-2014, 11:13 PM

Quote:

Originally Posted by Mit_Boost

Do you have a catless exhaust tune?

Nope

Mit_Boost · 01-28-2014, 11:13 PM

^^Editted my post.... Check fault codes, might be damaged o2s triggering the code from swapping exhausts.

BPMSport · 01-28-2014, 11:52 PM

Quote:

Originally Posted by mrkhanna16

I went from a fully catless setup that threw a check engine light code to stock and the check engine light code has not gone away? Help?

It will clear after awhile if the light was on specifically for cat efficiency. It may be related to something else.

SflBimmer8484 · 01-29-2014, 09:13 AM

Check the codes and report back. Like others have said you may have a bad / damaged o2. We have changes many many o2's in the past.

1MOREMOD · 01-29-2014, 09:14 AM

probably will take several key cycles to clear just like when you go catless it takes some cars long time to show the cel.

Grail05 · 01-29-2014, 09:58 AM

ive had catless before and light came on.. then put back to stock and reset it with OBD2 reader it was fine afterwards. have you cleared the codes.?

if not then it takes several days before it goes away.. keep in mind that it varies from cars to cars...

if your code does not go away within i say 3-4 days you might have messed up your sensor..

grantmax · 01-29-2014, 03:16 PM

Quote:

Originally Posted by 1MOREMOD

probably will take several key cycles to clear just like when you go catless it takes some cars long time to show the cel.

This.

Key cycles and miles are typically required for a full ecu reset/recalibration.

Some say its 4 key cycles of 11 miles or more. Others say its 50miles in one cycle. Long story short, just drive it for now.

Are you sure you put the O2s back correctly? I must admit that I've swapped banks before

s85e90 · 01-29-2014, 03:50 PM

@ 300 miles of driving got the CEL to go out for me. Or you could just reset it now

mrkhanna16 · 01-29-2014, 04:32 PM

Thanks guys its not a big deal, ill take it to my dealer if it continues after another week

01-28-2014, 11:12 PM	#1
mrkhanna16 Captain 74 Rep 974 Posts Drives: E92 M3 SSII/Fox Red ZCP DCT Join Date: Dec 2008 Location: LA iTrader: (3) Garage List 2011 BMW M3 [0.00]	CATLESS to STOCK?!?! I went from a fully catless setup that threw a check engine light code to stock and the check engine light code has not gone away? Help? __________________ E92 M3 SSII/Fox Red, DCT, ZCP past rides-IS350, E92 335i
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01-28-2014, 11:12 PM	#2
Mit_Boost Captain 135 Rep 692 Posts Drives: E90 335 Join Date: Dec 2013 Location: NJ iTrader: (0)	Have you read the fault codes? __________________ Results >
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01-28-2014, 11:13 PM	#4
Mit_Boost Captain 135 Rep 692 Posts Drives: E90 335 Join Date: Dec 2013 Location: NJ iTrader: (0)	^^Editted my post.... Check fault codes, might be damaged o2s triggering the code from swapping exhausts. __________________ Results >
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01-29-2014, 09:13 AM	#6
SflBimmer8484 Brigadier General 1467 Rep 3,157 Posts Drives: . Join Date: Dec 2011 Location: Florida iTrader: (5)	Check the codes and report back. Like others have said you may have a bad / damaged o2. We have changes many many o2's in the past.
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01-29-2014, 09:14 AM	#7
1MOREMOD - 11817 Rep 23,187 Posts Drives: Race car-> Join Date: Mar 2009 Location: check your mirrors iTrader: (5)	probably will take several key cycles to clear just like when you go catless it takes some cars long time to show the cel. __________________ 02 Tiag e46 M3\|6MT\|GC plates\|MCS c.o.\|GC bars\|GC race control arms\|GC bushings\|BW eng. & tran. mounts\|subframe kit\|BW race shifter\|BW Jaffster\|Euro header\|BW exhaust\|K&N c.a.i.\|Epic race tune\|Rouge pulleys\|Seibon CF hood\|CSL bumper\|apr gt 250 & splitter\|ST-40\|XR-2\|SS lines\|half cage\|Recaro profi\|Profi 2 harness\|BMWpedals\|BW studs\|
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01-29-2014, 09:58 AM	#8
Grail05 Putcha ang ganda... 279 Rep 5,441 Posts Drives: 17 F82 M4 Join Date: Feb 2010 Location: Los Angeles, Brea CA. iTrader: (10)	ive had catless before and light came on.. then put back to stock and reset it with OBD2 reader it was fine afterwards. have you cleared the codes.? if not then it takes several days before it goes away.. keep in mind that it varies from cars to cars... if your code does not go away within i say 3-4 days you might have messed up your sensor.. __________________
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01-29-2014, 03:50 PM	#10
s85e90 Brigadier General 192 Rep 3,633 Posts Drives: black e90 Join Date: Jan 2014 Location: everywhere iTrader: (2)	@ 300 miles of driving got the CEL to go out for me. Or you could just reset it now
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01-29-2014, 04:32 PM	#11
mrkhanna16 Captain 74 Rep 974 Posts Drives: E92 M3 SSII/Fox Red ZCP DCT Join Date: Dec 2008 Location: LA iTrader: (3) Garage List 2011 BMW M3 [0.00]	Thanks guys its not a big deal, ill take it to my dealer if it continues after another week __________________ E92 M3 SSII/Fox Red, DCT, ZCP past rides-IS350, E92 335i
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