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2019+ BMW 3 AND 4-SERIES FORUMS (G2x Generation) General G20 Sedan / G22 Coupe / G26 Gran Coupe Discussions 2020 m340i CEL w/ VRSF catted downpipe

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      03-05-2021, 09:41 PM   #1
jwl_m340_G20
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2020 m340i CEL w/ VRSF catted downpipe

I know this topic has likely been discussed, but haven't found anything useful. As everyone probably knows BMWs recent software update has made it impossible for anyone to unlock their DME/ECU in the 2020 m340i. I have spoken to many reputable tuners and no one has figured it out - Dinan is the closest to figuring it out, but in their own words "we have no idea when we will be able to launch because we keep taking 2 steps forward, and 1 step back".

I initially installed the VRSF high flow catted downpipe with the intent of shutting off my CEL with a flash tune (either Bootmod3 or MHD). Since that is no longer an option, I want to find another way to shut off my CEL... and in the meantime am forced to use everyone's favorite piggy back tune (small joke)... JB4.

Has anyone used another mod to shut off the CEL? Potentially the Fabspeed Universal 02 Spacer w/ Cat (image attached)? Are there any other solutions to getting rid of my CEL? Last thing I need is to have a real engine issue that I am unaware of because my CEL is on at all times.
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      03-06-2021, 08:50 AM   #2
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Logos Engineering Motorworks 200 Cell catted downpipe (Review & pics) https://g20.bimmerpost.com/forums/sh....php?t=1791867

Some previous discussion on this same topic.

In this example, we discussed using the spacer.
Mechanical means of a work-around maybe your only solution at this time.
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      03-06-2021, 02:09 PM   #3
jwl_m340_G20
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Quote:
Originally Posted by seccsc View Post
Logos Engineering Motorworks 200 Cell catted downpipe (Review & pics) https://g20.bimmerpost.com/forums/sh....php?t=1791867

Some previous discussion on this same topic.

In this example, we discussed using the spacer.
Mechanical means of a work-around maybe your only solution at this time.
Okay - so long story short is the Fabspeed 02 spacers I highlighted and attached should do the trick. Or am I misinterpreting?
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      03-06-2021, 08:20 PM   #4
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Quote:
Originally Posted by jwl_m340_G20 View Post
Quote:
Originally Posted by seccsc View Post
Logos Engineering Motorworks 200 Cell catted downpipe (Review & pics) https://g20.bimmerpost.com/forums/sh....php?t=1791867

Some previous discussion on this same topic.

In this example, we discussed using the spacer.
Mechanical means of a work-around maybe your only solution at this time.
Okay - so long story short is the Fabspeed 02 spacers I highlighted and attached should do the trick. Or am I misinterpreting?
I agree that should work!
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      03-06-2021, 09:53 PM   #5
jwl_m340_G20
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Quote:
Originally Posted by seccsc View Post
Quote:
Originally Posted by jwl_m340_G20 View Post
Quote:
Originally Posted by seccsc View Post
Logos Engineering Motorworks 200 Cell catted downpipe (Review & pics) https://g20.bimmerpost.com/forums/sh....php?t=1791867

Some previous discussion on this same topic.

In this example, we discussed using the spacer.
Mechanical means of a work-around maybe your only solution at this time.
Okay - so long story short is the Fabspeed 02 spacers I highlighted and attached should do the trick. Or am I misinterpreting?
I agree that should work!
Dumb ass question - but do I just need one for my downpipe or 2 for each exhaust tip?
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      03-07-2021, 06:37 AM   #6
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Quote:
Originally Posted by jwl_m340_G20 View Post
Quote:
Originally Posted by seccsc View Post
Quote:
Originally Posted by jwl_m340_G20 View Post
Quote:
Originally Posted by seccsc View Post
Logos Engineering Motorworks 200 Cell catted downpipe (Review & pics) https://g20.bimmerpost.com/forums/sh....php?t=1791867

Some previous discussion on this same topic.

In this example, we discussed using the spacer.
Mechanical means of a work-around maybe your only solution at this time.
Okay - so long story short is the Fabspeed 02 spacers I highlighted and attached should do the trick. Or am I misinterpreting?
I agree that should work!
Dumb ass question - but do I just need one for my downpipe or 2 for each exhaust tip?
Only one.
The upstream O2 sensor of catalytic converter provides feedback to the DME. The downstream O2(which is also on the down pipe) is where you would install this J-style connector and is the "dummy" O2 that measures the effectiveness of the cat. There are no other O2 sensors that I can find in the exhaust.
The original link I posted above provides clear directions where to install.

This link also shows the O2 sensors and I only found two.
https://www.realoem.com/bmw/enUS/sho...diagId=18_1524
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      03-07-2021, 10:45 AM   #7
jwl_m340_G20
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Quote:
Originally Posted by seccsc View Post
Quote:
Originally Posted by jwl_m340_G20 View Post
Quote:
Originally Posted by seccsc View Post
Quote:
Originally Posted by jwl_m340_G20 View Post
Quote:
Originally Posted by seccsc View Post
Logos Engineering Motorworks 200 Cell catted downpipe (Review & pics) https://g20.bimmerpost.com/forums/sh....php?t=1791867

Some previous discussion on this same topic.

In this example, we discussed using the spacer.
Mechanical means of a work-around maybe your only solution at this time.
Okay - so long story short is the Fabspeed 02 spacers I highlighted and attached should do the trick. Or am I misinterpreting?
I agree that should work!
Dumb ass question - but do I just need one for my downpipe or 2 for each exhaust tip?
Only one.
The upstream O2 sensor of catalytic converter provides feedback to the DME. The downstream O2(which is also on the down pipe) is where you would install this J-style connector and is the "dummy" O2 that measures the effectiveness of the cat. There are no other O2 sensors that I can find in the exhaust.
The original link I posted above provides clear directions where to install.

This link also shows the O2 sensors and I only found two.
https://www.realoem.com/bmw/enUS/sho...diagId=18_1524
Thanks a lot - much appreciated
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      03-07-2021, 11:08 AM   #8
Mr.G20 M340
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I have the vrsf DP as well and have CEL. I have tried using a 90 degree 02 spacer and it didn't take cel off so let me know if this works
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2020 Portimao Blue M340 X Drive and adaptive suspension.
Mods: custom exhaust, VRSF Catted DP, Injen intake and Chargepipe.
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      03-07-2021, 11:34 AM   #9
jwl_m340_G20
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Quote:
Originally Posted by Mr.G20 M340 View Post
I have the vrsf DP as well and have CEL. I have tried using a 90 degree 02 spacer and it didn't take cel off so let me know if this works
Ya my tuner said no shot it would work, that's why I wanted to ask the question. Which 02 spacers you use?
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      03-08-2021, 04:51 PM   #10
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02 spacer or even a mini cat will not work. I have tried this on my B58D in my 2020 X3 M40i with no luck. Always comes back in a few drive cycles. If not a catalyst efficiency fault I would get a catalyst heater fault. These new engines are very smart now.
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      03-08-2021, 07:40 PM   #11
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Quote:
Originally Posted by freshxdough View Post
02 spacer or even a mini cat will not work. I have tried this on my B58D in my 2020 X3 M40i with no luck. Always comes back in a few drive cycles. If not a catalyst efficiency fault I would get a catalyst heater fault. These new engines are very smart now.
Yup that's what I thought - looks like I'm buying the Active Autowerks one when back in stock
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      03-09-2021, 12:05 AM   #12
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I tried all the tricks. Nothing worked, eventually mine cleared itself and stays off mostly only back when really really cold. Or when I'm shit kicking it real good. But always clears again.
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      03-09-2021, 03:42 PM   #13
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Quote:
Originally Posted by jwl_m340_G20 View Post
Quote:
Originally Posted by freshxdough View Post
02 spacer or even a mini cat will not work. I have tried this on my B58D in my 2020 X3 M40i with no luck. Always comes back in a few drive cycles. If not a catalyst efficiency fault I would get a catalyst heater fault. These new engines are very smart now.
Yup that's what I thought - looks like I'm buying the Active Autowerks one when back in stock
Yeah. If you don't go with a tune to clear the CEL, the. I believe you will need like a 300cel to make sure you don't get a catalyst fault. I have 200 cel and it triggers 2nd drive cycle every time after clearing. I think AA is also 300cel or higher but still less than stock. Will give a good sound increase as well.
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      03-10-2021, 12:13 AM   #14
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Is it safe for us to run a downpipe and intake without a tune ?



Quote:
Originally Posted by jwl_m340_G20 View Post
Thanks a lot - much appreciated
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      03-14-2021, 03:49 PM   #15
jwl_m340_G20
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Quote:
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Is it safe for us to run a downpipe and intake without a tune ?



Quote:
Originally Posted by jwl_m340_G20 View Post
Thanks a lot - much appreciated
Yes - no issues. You already have an intake and a downpipe in your car... aftermarket ones are typically just better than stock. My recommendation on a downpipe is getting one that won't turn on your CEL. I regret buying the VRSF one for this reason - Fabspeed and Active Autowerks both guarantee no CEL on their website.

And if you so tune, these will keep your car in good health... especially when going Stage 2.

On the intake, a lot of people don't do this, but I liked installing an oil catch can as well (keeps your intake clean of oil contaminants). I purchased both from Burger because they are pretty cost effective.
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      03-18-2021, 11:15 PM   #16
jwl_m340_G20
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Anyone have recommendations for a downpipe that won't throw off a CEL on the 2020 M340i? I know Active Autowerks has one but it's out of stock.
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