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BMW 3-Series and 4-Series Forum (F30 / F32) | F30POST > Technical Forums > N20, N26, B46, B48 Turbo Engine / Drivetrain / Exhaust Modifications > no CEL for catless downpipe
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      01-31-2018, 04:28 PM   #1
bmwchue
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no CEL for catless downpipe

im seeing alot of members here getting cel for the o2 sensor after putting in a catless downpipe. I have jb4 with VRSF catless downpipe with a dorman 42009 spark plug non-fouler $6 (buy it at autozone/oreilly) installed with the rear 02 sensor. This had worked for me from the start and never received a cel. good luck.
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      01-31-2018, 05:38 PM   #2
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Thanks Chue. This keeps coming up a lot lately.
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      02-02-2018, 09:12 AM   #3
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I thought the JB4 removes the CEL for catless downpipes.
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      02-02-2018, 09:14 AM   #4
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Quote:
Originally Posted by Relax19 View Post
I thought the JB4 removes the CEL for catless downpipes.
BMS is trying to get the JB4 to be CARB legal so they had to remove the CEL delete
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      02-05-2018, 10:58 AM   #5
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Sub'd for long term results. I have heard that they do not last, but would like to see your experience.
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      02-05-2018, 11:20 AM   #6
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I just picked one up from O'reilly's, same part number actually. It looks like it comes with 2 in the package (same as above). Planning to do a muffler delete in the next few months; I'll have the shop throw it in when they're doing the work and report back
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      02-05-2018, 12:06 PM   #7
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Sub'd for long term results. I have heard that they do not last, but would like to see your experience.
2 months now so far good
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      02-05-2018, 01:44 PM   #8
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2 months now so far good
Wow.. Pretty impressed its gone that long without a CEL..

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      02-05-2018, 03:34 PM   #9
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Did you use 1 or both of them in the package?
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      02-05-2018, 04:56 PM   #10
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Quote:
Originally Posted by Mike@N54Tuning.com View Post
Wow.. Pretty impressed its gone that long without a CEL..

Mike
This is what i used back in my honda days and it worked so i figure why not on a bmw lol
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      02-05-2018, 04:57 PM   #11
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Did you use 1 or both of them in the package?
One only
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      02-06-2018, 01:56 PM   #12
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This is great. Thank you a bunch. I am going to be installing an AFE catless downpipe and Supersprint front pipe soon, so this is perfect timing.
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      03-05-2018, 05:58 PM   #13
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Any one "explain like I'm 5" on how this works?





Sonic
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      03-05-2018, 08:28 PM   #14
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Any one "explain like I'm 5" on how this works?





Sonic
it removes the O2 sensor from direct contact with emissions by spacing it back from the flow of exhaust gases a bit. therefore causing the sensor to detect less harmful gases than are actually being produced.
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      03-05-2018, 08:30 PM   #15
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Puts the o2 sensor futher away from the airflow, causing the sensor to pick up less unburnt fuel (I believe no2,co)... orginally, the cats is designed to turn those gases into N2 and CO2... When putting the sensor further back it, the o2 sensor picks up less of those harmful gases and thinks the cat is still installed and working fine.
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      03-05-2018, 10:23 PM   #16
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I've been running a catless downpipe and JB4 for about two months now and did not receive CEL, although I did get codes once or twice on the JB4 "catless downpipe detected"
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      06-22-2018, 12:17 AM   #17
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Will this fit the 428ix? Sorry for the late chime-in... bmwchue have you gotten any cel codes?
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      06-22-2018, 03:41 PM   #18
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Quote:
Originally Posted by Fr3sh View Post
Will this fit the 428ix? Sorry for the late chime-in... bmwchue have you gotten any cel codes?
Yes, it will fit anything with an O2 sensor I believe. It's not fool proof, but you shouldn't get a CEL with it.
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      06-24-2018, 11:07 PM   #19
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So I installed the 02 spacer today and about 50+miles I read a code
- 128901 lambda probe before catalytic converters, dynamic: slow reaction mean?
I cleared the code and hasn’t come back since, should I be worried or is it just the jb4 via Bluetooth app telling me I have catless? (er catless)
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      06-25-2018, 09:17 AM   #20
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6months into still no code
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      06-25-2018, 01:09 PM   #21
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Quote:
Originally Posted by bmwchue View Post
6months into still no code
Just thinking out loud here, but do you just replace the non-fouler with a new one if/when the CEL comes back?
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      06-26-2018, 03:20 PM   #22
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if mine would come on by chance I would either clean it or replace it. if that doesn't work I'll extend it
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