Running JB4 with catless Downpipes

28m5 · 11-06-2021, 02:26 PM

Hi, I'm running JB4 on my 2020 M5 Comp and occasionally get the catless downpipe detected fault code. Is there any way to permanently clear the fault code ? Can I run a custom map only to delete the fault code and stick to the JB4? The JB4 provides flexibility which normal tunes don't when you don't have constant access to higher quality fuel.

pbonsalb · 11-06-2021, 02:39 PM

JB4 won’t simulate the rear 02 for the US market anymore. The feds threatened them.

AngryInch · 11-06-2021, 04:57 PM

Only a tune removes the CEL.

I just live with it. I have traction control always off so there is two yellow lights there... No big deal.

28m5 · 11-06-2021, 11:55 PM

Quote:

Originally Posted by AngryInch

Only a tune removes the CEL.

I just live with it. I have traction control always off so there is two yellow lights there... No big deal.

Quote:

Originally Posted by AngryInch

Only a tune removes the CEL.

I just live with it. I have traction control always off so there is two yellow lights there... No big deal.

Good one, does the drivetrain error reduce power or anything ?

mike@x-ph.com · 11-07-2021, 09:07 AM

Per your account, it shows that you are located in India.

The Jb4 should be able to hide the code for you since you are outside of the US, contact BMS support.

28m5 · 11-07-2021, 11:15 AM

Quote:

Originally Posted by mike@x-ph.com

Per your account, it shows that you are located in India.

The Jb4 should be able to hide the code for you since you are outside of the US, contact BMS support.

Quote:

Originally Posted by mike@x-ph.com

Per your account, it shows that you are located in India.

The Jb4 should be able to hide the code for you since you are outside of the US, contact BMS support.

Yes I am in india. Will mail them right away. Any idea what the process is like? This would be of great help.

mike@x-ph.com · 11-08-2021, 08:42 AM

Quote:

Originally Posted by 28m5

Yes I am in india. Will mail them right away. Any idea what the process is like? This would be of great help.

Not sure to be honest as i have never done it but i remember when they first made the change to the JB4 and CEL, they said its only for US customers.

11-06-2021, 02:26 PM	#1
28m5 New Member 2 Rep 16 Posts Drives: 2020 BMW M5 Competition Join Date: May 2021 Location: Goa iTrader: (0)	Running JB4 with catless Downpipes Hi, I'm running JB4 on my 2020 M5 Comp and occasionally get the catless downpipe detected fault code. Is there any way to permanently clear the fault code ? Can I run a custom map only to delete the fault code and stick to the JB4? The JB4 provides flexibility which normal tunes don't when you don't have constant access to higher quality fuel. __________________ 2020 BMW M5 Competition Donington Grey
	Appreciate 0 Tweet Quote

11-06-2021, 02:39 PM	#2
pbonsalb Lieutenant General 5234 Rep 10,616 Posts Drives: 18 F90 M5, 99 E36 M3 Turbo Join Date: Feb 2011 Location: New England iTrader: (4)	JB4 won’t simulate the rear 02 for the US market anymore. The feds threatened them.
	Appreciate 0 Quote

11-06-2021, 04:57 PM	#3
AngryInch Lieutenant 213 Rep 548 Posts Drives: 2021 BMW M5 Comp Join Date: Jul 2021 Location: Canada iTrader: (0)	Only a tune removes the CEL. I just live with it. I have traction control always off so there is two yellow lights there... No big deal.
	Appreciate 0 Quote

11-07-2021, 09:07 AM	#5
mike@x-ph.com Joint Chiefs of Staff 24199 Rep 190,807 Posts Drives: 07-335/12-328/18-M4/21-M4CP Join Date: Sep 2013 Location: Las Vegas iTrader: (23)	Per your account, it shows that you are located in India. The Jb4 should be able to hide the code for you since you are outside of the US, contact BMS support. __________________ Check out our current sale by clicking on this link! https://x-ph.com/sale/ Phone number 702-494-9435
	Appreciate 0 Quote