Stock Downpipe's smog issue

Qasimateen · 07-20-2019, 05:52 AM

So back in 2017 I replaced my Downpipe's to catless (obviously for power). Now I have smog due this month so I installed my stock downpipes I had sitting in my garage just so I can drive it around with it to pass smog.
The problem is how long would it be good enough to be clear to go get it tested for smog. I have an obd reader that tests for smog and it says that my catalytics are still an issue according to the obd. I cleared everything and went back to map 0 and drive about 60+ miles but I'm still getting the catalytic error. Also i logged the sensors before and after the cats and there are voltages goin thru the same on both Cats so I'm assuming the sensors are fine. How long should I drive it to have it be ok to get it smog checked?
Also how much temperature difference should there be before and after the cats??

mweisdorfer · 07-20-2019, 10:08 AM

Quote:

Originally Posted by Qasimateen

So back in 2017 I replaced my Downpipe's to catless (obviously for power). Now I have smog due this month so I installed my stock downpipes I had sitting in my garage just so I can drive it around with it to pass smog.
The problem is how long would it be good enough to be clear to go get it tested for smog. I have an obd reader that tests for smog and it says that my catalytics are still an issue according to the obd. I cleared everything and went back to map 0 and drive about 60+ miles but I'm still getting the catalytic error. Also i logged the sensors before and after the cats and there are voltages goin thru the same on both Cats so I'm assuming the sensors are fine. How long should I drive it to have it be ok to get it smog checked?
Also how much temperature difference should there be before and after the cats??

Reset the adaptations

Qasimateen · 07-20-2019, 03:24 PM

Quote:

Originally Posted by mweisdorfer

Quote:

Originally Posted by Qasimateen

So back in 2017 I replaced my Downpipe's to catless (obviously for power). Now I have smog due this month so I installed my stock downpipes I had sitting in my garage just so I can drive it around with it to pass smog.
The problem is how long would it be good enough to be clear to go get it tested for smog. I have an obd reader that tests for smog and it says that my catalytics are still an issue according to the obd. I cleared everything and went back to map 0 and drive about 60+ miles but I'm still getting the catalytic error. Also i logged the sensors before and after the cats and there are voltages goin thru the same on both Cats so I'm assuming the sensors are fine. How long should I drive it to have it be ok to get it smog checked?
Also how much temperature difference should there be before and after the cats??

Reset the adaptations

If you don't mind, explain which exact adaptions to reset and explain how it's gonna work?

Btw When I reset all codes I resetted everything where the abs lights and all those dash lights came on for a second.

mweisdorfer · 07-20-2019, 07:43 PM

Quote:

Originally Posted by Qasimateen

Quote:

Originally Posted by mweisdorfer

Quote:

Originally Posted by Qasimateen

So back in 2017 I replaced my Downpipe's to catless (obviously for power). Now I have smog due this month so I installed my stock downpipes I had sitting in my garage just so I can drive it around with it to pass smog.
The problem is how long would it be good enough to be clear to go get it tested for smog. I have an obd reader that tests for smog and it says that my catalytics are still an issue according to the obd. I cleared everything and went back to map 0 and drive about 60+ miles but I'm still getting the catalytic error. Also i logged the sensors before and after the cats and there are voltages goin thru the same on both Cats so I'm assuming the sensors are fine. How long should I drive it to have it be ok to get it smog checked?
Also how much temperature difference should there be before and after the cats??

Reset the adaptations

If you don't mind, explain which exact adaptions to reset and explain how it's gonna work?

Btw When I reset all codes I resetted everything where the abs lights and all those dash lights came on for a second.

Do you have MHD?

Qasimateen · 07-20-2019, 07:44 PM

Quote:

Originally Posted by mweisdorfer

Quote:

Originally Posted by Qasimateen

Quote:

Originally Posted by mweisdorfer

Quote:

Originally Posted by Qasimateen

So back in 2017 I replaced my Downpipe's to catless (obviously for power). Now I have smog due this month so I installed my stock downpipes I had sitting in my garage just so I can drive it around with it to pass smog.
The problem is how long would it be good enough to be clear to go get it tested for smog. I have an obd reader that tests for smog and it says that my catalytics are still an issue according to the obd. I cleared everything and went back to map 0 and drive about 60+ miles but I'm still getting the catalytic error. Also i logged the sensors before and after the cats and there are voltages goin thru the same on both Cats so I'm assuming the sensors are fine. How long should I drive it to have it be ok to get it smog checked?
Also how much temperature difference should there be before and after the cats??

Reset the adaptations

If you don't mind, explain which exact adaptions to reset and explain how it's gonna work?

Btw When I reset all codes I resetted everything where the abs lights and all those dash lights came on for a second.

Do you have MHD?

Yes

mweisdorfer · 07-20-2019, 08:41 PM

Quote:

Originally Posted by Qasimateen

Quote:

Originally Posted by mweisdorfer

Quote:

Originally Posted by Qasimateen

Quote:

Originally Posted by mweisdorfer

Quote:

Originally Posted by Qasimateen

So back in 2017 I replaced my Downpipe's to catless (obviously for power). Now I have smog due this month so I installed my stock downpipes I had sitting in my garage just so I can drive it around with it to pass smog.
The problem is how long would it be good enough to be clear to go get it tested for smog. I have an obd reader that tests for smog and it says that my catalytics are still an issue according to the obd. I cleared everything and went back to map 0 and drive about 60+ miles but I'm still getting the catalytic error. Also i logged the sensors before and after the cats and there are voltages goin thru the same on both Cats so I'm assuming the sensors are fine. How long should I drive it to have it be ok to get it smog checked?
Also how much temperature difference should there be before and after the cats??

Reset the adaptations

If you don't mind, explain which exact adaptions to reset and explain how it's gonna work?

Btw When I reset all codes I resetted everything where the abs lights and all those dash lights came on for a second.

Do you have MHD?

Yes

Go to codes & reset your adaptations for the O2 sensors

Qasimateen · 07-20-2019, 08:46 PM

Quote:

Originally Posted by mweisdorfer

Quote:

Originally Posted by Qasimateen

Quote:

Originally Posted by mweisdorfer

Quote:

Originally Posted by Qasimateen

Quote:

Originally Posted by mweisdorfer

Quote:

Originally Posted by Qasimateen

So back in 2017 I replaced my Downpipe's to catless (obviously for power). Now I have smog due this month so I installed my stock downpipes I had sitting in my garage just so I can drive it around with it to pass smog.
The problem is how long would it be good enough to be clear to go get it tested for smog. I have an obd reader that tests for smog and it says that my catalytics are still an issue according to the obd. I cleared everything and went back to map 0 and drive about 60+ miles but I'm still getting the catalytic error. Also i logged the sensors before and after the cats and there are voltages goin thru the same on both Cats so I'm assuming the sensors are fine. How long should I drive it to have it be ok to get it smog checked?
Also how much temperature difference should there be before and after the cats??

Reset the adaptations

If you don't mind, explain which exact adaptions to reset and explain how it's gonna work?

Btw When I reset all codes I resetted everything where the abs lights and all those dash lights came on for a second.

Do you have MHD?

Yes

Go to codes & reset your adaptations for the O2 sensors

There's no option to reset O2 sensors...

valibad · 07-21-2019, 03:48 AM

Quote:

Originally Posted by Qasimateen

There's no option to reset O2 sensors...

Lambda sensors

Qasimateen · 07-28-2019, 06:00 PM

Quote:

Originally Posted by valibad

Quote:

Originally Posted by Qasimateen

There's no option to reset O2 sensors...

Lambda sensors

I've reset everything and drove 400 miles and it still says smog won't pass due to catalytic issue. Where do I go from here because the voltage from both sensor 2 work. Do I keep driving?

Qasimateen · 07-28-2019, 06:03 PM

Quote:

Originally Posted by Qasimateen

So back in 2017 I replaced my Downpipe's to catless (obviously for power). Now I have smog due this month so I installed my stock downpipes I had sitting in my garage just so I can drive it around with it to pass smog.
The problem is how long would it be good enough to be clear to go get it tested for smog. I have an obd reader that tests for smog and it says that my catalytics are still an issue according to the obd. I cleared everything and went back to map 0 and drive about 60+ miles but I'm still getting the catalytic error. Also i logged the sensors before and after the cats and there are voltages goin thru the same on both Cats so I'm assuming the sensors are fine. How long should I drive it to have it be ok to get it smog checked?
Also how much temperature difference should there be before and after the cats??

One thing to note I have jb4 mhd bef and I'm currently on map 0 and I have the bef pump flash on. Does that affect it??

type-dRew · 07-29-2019, 07:52 AM

stage 0 in mhd will still not throw codes for catless downpipes, you have to manually check the 'stock downpipe' box in the options menu for it to provide sensor 'readiness'

Qasimateen · 07-30-2019, 03:16 AM

Quote:

Originally Posted by type-dRew

stage 0 in mhd will still not throw codes for catless downpipes, you have to manually check the 'stock downpipe' box in the options menu for it to provide sensor 'readiness'

Yea my fault. I just reflashed and checked the box for oem Downpipe
Quick question tho. In my smog test it says everything (including oxygen sensors) are ready except catalytic. Are my cats actually bad since my oxygen sensors work or is it just my previous mhd flash that's causing cats to not be ready???

type-dRew · 07-30-2019, 08:20 AM

should just need to drive it more

Qasimateen · 08-01-2019, 01:54 PM

Passed smog!!! Definitely the mhd oem/catted Downpipe option needs to be checked in order to pass

07-20-2019, 05:52 AM	#1
Qasimateen Enlisted Member 7 Rep 42 Posts Drives: Bmw 335i Join Date: Jun 2019 Location: Rancho cucamonga iTrader: (0)	Stock Downpipe's smog issue So back in 2017 I replaced my Downpipe's to catless (obviously for power). Now I have smog due this month so I installed my stock downpipes I had sitting in my garage just so I can drive it around with it to pass smog. The problem is how long would it be good enough to be clear to go get it tested for smog. I have an obd reader that tests for smog and it says that my catalytics are still an issue according to the obd. I cleared everything and went back to map 0 and drive about 60+ miles but I'm still getting the catalytic error. Also i logged the sensors before and after the cats and there are voltages goin thru the same on both Cats so I'm assuming the sensors are fine. How long should I drive it to have it be ok to get it smog checked? Also how much temperature difference should there be before and after the cats??
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07-29-2019, 07:52 AM	#11
type-dRew Major 642 Rep 1,245 Posts Drives: 2009 335i xDrive Join Date: Feb 2019 Location: Newport MI iTrader: (0)	stage 0 in mhd will still not throw codes for catless downpipes, you have to manually check the 'stock downpipe' box in the options menu for it to provide sensor 'readiness' __________________ 2009 335i xDrive AT / 177k+ miles PSP 750ic / Fuel-It! Stage 1 / BMS CP / Sutphin Tuning / RFP E50 11.61 @ 117.5 New setup; Covid 19Ts on RFP 93 + ARM inlets, dp, VTT cp and PSP outlets
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07-30-2019, 08:20 AM	#13
type-dRew Major 642 Rep 1,245 Posts Drives: 2009 335i xDrive Join Date: Feb 2019 Location: Newport MI iTrader: (0)	should just need to drive it more __________________ 2009 335i xDrive AT / 177k+ miles PSP 750ic / Fuel-It! Stage 1 / BMS CP / Sutphin Tuning / RFP E50 11.61 @ 117.5 New setup; Covid 19Ts on RFP 93 + ARM inlets, dp, VTT cp and PSP outlets
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08-01-2019, 01:54 PM	#14
Qasimateen Enlisted Member 7 Rep 42 Posts Drives: Bmw 335i Join Date: Jun 2019 Location: Rancho cucamonga iTrader: (0)	Passed smog!!! Definitely the mhd oem/catted Downpipe option needs to be checked in order to pass
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