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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N54 Turbo Engine / Drivetrain / Exhaust Modifications - 335i > Emissions with JB4



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      03-13-2012, 02:29 AM   #1
Cromartie84
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Emissions with JB4

With catless down pipes and a jb4 will my car pass emissions computer hookup or do I need the something else?
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      03-13-2012, 04:43 AM   #2
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If they check for readiness you will fail with Can clear on. you need dpfix and drive for some time to have the readiness ok again.
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      03-13-2012, 06:19 AM   #3
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Quote:
Originally Posted by enrita
If they check for readiness you will fail with Can clear on. you need dpfix and drive for some time to have the readiness ok again.
Dp fix from BMS correct?
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      04-02-2012, 07:06 PM   #4
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Same question... which DPfix are you talking about? Shouldn't the JB4 already have a DPfix in it? if you turn auto clear off will the DPfix in the JB4 be enough to pass the readiness? what mode does the JB4 have to be in (bypass or any map)??? Ive been reading threads like this all day and no one seems to answer these simple questions ?!?!
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      04-02-2012, 07:23 PM   #5
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The JB4 clears any CEL codes, but does not set the readiness needed for emissions check.

As Enrita stated you need the BMS DPFix to ensure you don't fail the inspection.

I picked one up used in the FS section for 40. Money well spent.
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      04-02-2012, 11:58 PM   #6
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I've never failed emissions, but in AZ i know they are stricter than other states, if you fail you aren't fined, correct? Sorry for hijack.
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      04-03-2012, 12:51 AM   #7
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I just passed my inspection. I have JB4 DPfix and AA downpipes. I live in NJ
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      04-03-2012, 09:24 AM   #8
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Quote:
Originally Posted by blaknite7 View Post
Same question... which DPfix are you talking about? Shouldn't the JB4 already have a DPfix in it? if you turn auto clear off will the DPfix in the JB4 be enough to pass the readiness? what mode does the JB4 have to be in (bypass or any map)??? Ive been reading threads like this all day and no one seems to answer these simple questions ?!?!
This is answered all the time.
There is only one DPFix, purchased for $80 or so new from BMS. For states that check emissions by plugging in to your OBDII port and checking readiness, it's the only way a catless DP will pass that.

The JB4 and other tunes can clear codes thrown by catless DPs, but that's not the same as preventing them and allowing readiness to get set.
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      04-03-2012, 09:34 AM   #9
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http://www.e90post.com/forums/showthread.php?t=670776
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      07-18-2015, 04:46 PM   #10
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Finally found the answer i needed lol thanks
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      07-18-2015, 05:15 PM   #11
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Quote:
Originally Posted by blkbeauty335i
Finally found the answer i needed lol thanks
3 year old thread revival? Lol
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