F30POST
F30POST
2012-2015 BMW 3-Series and 4-Series Forum
BMW Garage BMW Meets Register Search Today's Posts Mark Forums Read
BMW 3-Series and 4-Series Forum (F30 / F32) | F30POST > Technical Forums > N20, N26, B46, B48 Turbo Engine / Drivetrain / Exhaust Modifications > Question re: catted dp, CEL, and Bootmod3
ARMA SPEED
Post Reply
 
Thread Tools Search this Thread
      07-13-2021, 05:09 PM   #1
Sad N26
Private
21
Rep
51
Posts

Drives: 2016 328i X-Drive
Join Date: Mar 2018
Location: Northern Virginia

iTrader: (0)

Question Question re: catted dp, CEL, and Bootmod3

I am considering upgrading to a high-flow catted downpipe. However, we all know that even a catted downpipe will throw a code and cause the Check Engine Light to come on.

I understand that Bootmod3 can be programmed to eliminate the CEL. My question is: how exactly does it eliminate the CEL? Does the Bootmod3 programming allow for accurate reading of the exhaust through the O2 sensor but change the parameters within the DME as to what are acceptable readings in the exhaust? Or does it "trick" the DME into reading cleaner exhaust gasses? Or does it allow the O2 sensor to read accurately but it just overrides the DME's attempt to go into "limp" mode? or is it none of these?

Forgive my ignorance if none of these are legitimate possibilities.
I'd appreciate some clarification on how the CEL is eliminated. Thanks!
__________________
2016 328i XDrive N26 8AT: K&N Drop-In Air Filter * GPlus Intercooler * ER Chargepipe * DinanTronics Sport Tuner (Race +4psi) * AWE Mid-Pipe (2nd Cat Delete) * Dinan Axleback Exhaust * Dinan Sport Springs & Bump Stops * Megan Racing Front Strut Tower Bar * Cross-Drilled Rotors * Hawk HPS 5.0 Brake Pads * StopTech SS Brake Lines
Appreciate 0
      07-26-2021, 01:11 PM   #2
chhappy7
Captain
chhappy7's Avatar
140
Rep
623
Posts

Drives: 2015 328i RWD
Join Date: Mar 2018
Location: Hanover, NH

iTrader: (0)

Garage List
2015 328i  [0.00]
Quote:
Originally Posted by Sad N26 View Post
I am considering upgrading to a high-flow catted downpipe. However, we all know that even a catted downpipe will throw a code and cause the Check Engine Light to come on.

I understand that Bootmod3 can be programmed to eliminate the CEL. My question is: how exactly does it eliminate the CEL? Does the Bootmod3 programming allow for accurate reading of the exhaust through the O2 sensor but change the parameters within the DME as to what are acceptable readings in the exhaust? Or does it "trick" the DME into reading cleaner exhaust gasses? Or does it allow the O2 sensor to read accurately but it just overrides the DME's attempt to go into "limp" mode? or is it none of these?

Forgive my ignorance if none of these are legitimate possibilities.
I'd appreciate some clarification on how the CEL is eliminated. Thanks!
Iirc it just turns off the monitoring. So if you were to go do a emissions test with Bootmod3 cancelling the CEL, it will not pass.
__________________
2015 328i - M Sport front&rear bumper/diffuser, M3 style fender/side skirt, M Performance brakes, BBS SR, ceramic iDrive, LCI radio trim, 6WB, NBT EVO, X5M razor key
Appreciate 0
      07-26-2021, 01:33 PM   #3
Logicoeur
Lieutenant Colonel
Logicoeur's Avatar
818
Rep
1,755
Posts

Drives: F30 335i xDrive
Join Date: Feb 2018
Location: Boston

iTrader: (0)

Quote:
Originally Posted by chhappy7 View Post
Quote:
Originally Posted by Sad N26 View Post
I am considering upgrading to a high-flow catted downpipe. However, we all know that even a catted downpipe will throw a code and cause the Check Engine Light to come on.

I understand that Bootmod3 can be programmed to eliminate the CEL. My question is: how exactly does it eliminate the CEL? Does the Bootmod3 programming allow for accurate reading of the exhaust through the O2 sensor but change the parameters within the DME as to what are acceptable readings in the exhaust? Or does it "trick" the DME into reading cleaner exhaust gasses? Or does it allow the O2 sensor to read accurately but it just overrides the DME's attempt to go into "limp" mode? or is it none of these?

Forgive my ignorance if none of these are legitimate possibilities.
I'd appreciate some clarification on how the CEL is eliminated. Thanks!
Iirc it just turns off the monitoring. So if you were to go do a emissions test with Bootmod3 cancelling the CEL, it will not pass.
It will pass. It does what you said "prevent the monitor from throwing a code". This is not to be confused with setting the monitor to "pass". That would be illegal.

If your state allows monitor(s) to be in the "Not Ready" but not "failed" state, then you can pass as long as your "not ready" count is below that state threshold.

For eg. Many NE states like NY and MA allow 1 monitor in the "not ready" state. If the cat is the only monitor in this state you will pass. This is assuming that they don't attach anything to the muffler and do a sniff test, or have grounds to do a visual inspection under the hood.
__________________
F30 335iX | Remus Axleback | Circuitwerks Catted DP | VRSF Comp IC | 18X9 ET32 19lb TR-1 | 255/40/18 ECS | Clubsport coilovers | TMH 75mm 14x1.5 Studs | BMW MPerf LSD | XDelete | Pipercross Filter | MHD Stg2 93
Appreciate 0
      07-26-2021, 03:36 PM   #4
jtalweezy
Enlisted Member
18
Rep
47
Posts

Drives: 2017 BMW 330i xdrive (B46)
Join Date: Oct 2020
Location: Shelton, CT

iTrader: (0)

I passed emissions with it in "Not Ready" state. Works quite well.
__________________
2017 BMW 330i xdrive M-Sport Estoril Blue - B46 w/ ER Catless DP, ER Chargepipe, FTP Intake Charge Pipe, BMS Cone Intake, BMS OilCC, Bootmod3 Stage 2 OTS 93 octane (AGG Burble), FI Exhaust Suite with Secondary Cat Delete, xHP Stage 3 OTS Transmission tune
Appreciate 0
      07-26-2021, 03:46 PM   #5
rcaso26
Lieutenant
rcaso26's Avatar
United_States
245
Rep
427
Posts

Drives: 2015 328i xdrive
Join Date: Oct 2017
Location: Long Island, NY

iTrader: (0)

I have a 2015 328i (n26 motor) with an ER catted downpipe and bm3. I dont use the BM3 option to block the CEL and I have only had a CEL one time after pushing the car really hard. I cleared the code and it never came back. I have passed NY inspection with the catted downpipe. Just my two cents.
Appreciate 0
Post Reply

Bookmarks

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off



All times are GMT -5. The time now is 06:28 PM.




f30post
Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2021, vBulletin Solutions Inc.
1Addicts.com, BIMMERPOST.com, E90Post.com, F30Post.com, M3Post.com, ZPost.com, 5Post.com, 6Post.com, 7Post.com, XBimmers.com logo and trademark are properties of BIMMERPOST