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2010 2011 BMW 5 Series Forum F10 F10 Technical Topics Engine, Transmission, Exhaust, Drivetrain, ECU Software Modifications Bypassing a catalytic converter
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      03-17-2019, 10:35 PM   #1
Cmfigueroa16
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Bypassing a catalytic converter

Hey guys I have a 2012 f10 535i xdrive with a Catless downpipe.
Does anyone know if the Mini cat CEL fix adapters work? Or does anyone know what to do to pass ny state inspection without reinstalling your Cat?
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      03-18-2019, 02:40 PM   #2
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The mini cats don't work I had it installed and my check engine still came on. I just installed bm3 and just removed the o2 off the cats so far no check engine light.
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      03-18-2019, 04:27 PM   #3
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But will it pass emmisions?
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      03-18-2019, 04:47 PM   #4
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Quote:
Originally Posted by Cmfigueroa16 View Post
But will it pass emmisions?
no it will not
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      03-18-2019, 10:16 PM   #5
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Anyone anything that can be done to pass emmisions?
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      03-19-2019, 07:06 AM   #6
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Anyone know if the catsim simulator from area47 works?
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      03-20-2019, 10:16 PM   #7
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Bump
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      03-22-2019, 09:48 AM   #8
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Does your state do emissions from the obd2 port or through the tail pipe? When I lived in northern va they ran emissions and they would scan the obd2 port. I live in a state where they don't have emissions but I'm running a catless dp and bm3 so no cel when I had a jb4 cel would pop up after a few miles of driving even with the mini cats. I'm pretty sure if you don't have a cel when they scan it you should be fine with emissions but ever state is different.
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      03-24-2019, 09:16 PM   #9
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Yeah that doesn't work. Mini cats don't work and even with the jb4 when the code is reset the "emmisions system" has to reset. If you go to pass the inspection it will show emmisions system not ready and fail
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      03-31-2019, 01:40 PM   #10
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I run catless dp with o2 bung that connects to the dp to put the o2 sensor further away by like 2 inches. No cel at all and pass emissions without issues.
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      03-31-2019, 11:11 PM   #11
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Originally Posted by ziekxq View Post
I run catless dp with o2 bung that connects to the dp to put the o2 sensor further away by like 2 inches. No cel at all and pass emissions without issues.
You got photo of the o2 bung on your car and care to share the link to where we could purchase it.
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      04-01-2019, 12:58 PM   #12
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Originally Posted by top ramen View Post
You got photo of the o2 bung on your car and care to share the link to where we could purchase it.
Spark plug anti-fouler available at places like Advance Auto or AutoZone.

Spaces the sensor away from the exhaust flow in hopes that it doesn't measure as much harmful stuff. It's really a crap shoot whether or not it works and doesn't help if you have visual inspection or a sniffer test.
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