Dinan exhaust readiness code problem

Baruntse · 05-24-2018, 05:38 PM

So apparently I am a noob on any mods please bare with my stupidity:

After MHD flashing yesterday I felt very excited, today I read my DME codes for the first time. To my surprise, I have three readiness issues:
Catalyst: incomplete
Oxygen sensor: incomplete
Oxygen sensor heater: incomplete

Recently I have replaced my FMIC, CP, stock exhaust with a Dinan free flow exhaust, along with my MHD flash. I guess IC and CP are not going to mess up with my readiness so the Dinan exhaust is to blame here.

After I replaced my stock exhaust there is no CEL and everything looked normal until I can read the codes now. I always have a big concern about the emission test and that's why I am still hesitate to upgrade my DP with Fabspeed catted. Never would imagine that exhaust upgrade will also give me this problem.

I guess I really need to do a lot more research before I am doing anything.

Highly appreciate if anyone can help me on this! Any ways to solve this issue?Thanks in advance.

Tchao · 05-24-2018, 08:59 PM

Thats a readiness issue, not a Catalytic efficiency code.

Most likely flashing your ECU, will reset your ECU, therefore you need to complete a full drive cycle again to get the emissions monitoring system to ready status.
The same thing happens if you clear codes, or remove the battery.

Or your MHD is programed to disable the rear cat o2....Which in that case you will never reach ready status.
This feature is for people who have catless downpipe.

Baruntse · 05-25-2018, 01:56 AM

Quote:

Originally Posted by Tchao

Thats a readiness issue, not a Catalytic efficiency code.

Most likely flashing your ECU, will reset your ECU, therefore you need to complete a full drive cycle again to get the emissions monitoring system to ready status.
The same thing happens if you clear codes, or remove the battery.

Or your MHD is programed to disable the rear cat o2....Which in that case you will never reach ready status.
This feature is for people who have catless downpipe.

Thanks! I hope this is the case. I don't believe MHD will disable my O2 sensor. How many miles of driving will get my readiness back to normal?

JaredG_F30 · 05-25-2018, 07:08 AM

50 miles or so before readiness will be enabled. Your tune will prevent readiness as well. You should have an option to configure the tune to be OEM for cat efficiency.

Quote:

Originally Posted by Baruntse

Thanks! I hope this is the case. I don't believe MHD will disable my O2 sensor. How many miles of driving will get my readiness back to normal?

RoundelM3 · 05-25-2018, 07:44 AM

The Dinan exhaust is an axle-back design - basically a muffler, and has nothing at all to do with emissions readiness. Your flash tune is the culprit, as mentioned above.

Baruntse · 05-25-2018, 08:01 AM

Thanks all for your help!I will give an update after a week or so.

zinner · 05-25-2018, 05:41 PM

There is no O2 heater so that will never complete. On the flash tunes the tuners have been bypassing the O2 sensor check (it completes), but the Cat effectiveness will never complete. Flash back to a stock tune once a year for a few days.

Meanwhile all the diesels roll coal cause "work" trucks shouldn't pass emissions. *rolls eyes* (in NC)

after all my ranting I realized you are a dinan users. Just keep driving, it takes a few days/drive cycles. It should complete assuming you are still stock emissions. Unless you have an emissions equipment issue.

05-24-2018, 05:38 PM	#1
Baruntse Enlisted Member 6 Rep 15 Posts Drives: 3013 335i Join Date: May 2018 Location: Glastonbury, CT iTrader: (0)	Dinan exhaust readiness code problem So apparently I am a noob on any mods please bare with my stupidity: After MHD flashing yesterday I felt very excited, today I read my DME codes for the first time. To my surprise, I have three readiness issues: Catalyst: incomplete Oxygen sensor: incomplete Oxygen sensor heater: incomplete Recently I have replaced my FMIC, CP, stock exhaust with a Dinan free flow exhaust, along with my MHD flash. I guess IC and CP are not going to mess up with my readiness so the Dinan exhaust is to blame here. After I replaced my stock exhaust there is no CEL and everything looked normal until I can read the codes now. I always have a big concern about the emission test and that's why I am still hesitate to upgrade my DP with Fabspeed catted. Never would imagine that exhaust upgrade will also give me this problem. I guess I really need to do a lot more research before I am doing anything. Highly appreciate if anyone can help me on this! Any ways to solve this issue?Thanks in advance.
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05-24-2018, 08:59 PM	#2
Tchao Boost Addict 334 Rep 349 Posts Drives: E30, E82, F30, F87 Join Date: Feb 2015 Location: Charleston iTrader: (0)	Thats a readiness issue, not a Catalytic efficiency code. Most likely flashing your ECU, will reset your ECU, therefore you need to complete a full drive cycle again to get the emissions monitoring system to ready status. The same thing happens if you clear codes, or remove the battery. Or your MHD is programed to disable the rear cat o2....Which in that case you will never reach ready status. This feature is for people who have catless downpipe. __________________ S55 M2C \| Three Pedal Club \| E30TU
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05-25-2018, 07:44 AM	#5
RoundelM3 Major General 1837 Rep 6,990 Posts Drives: 15 F80 M3, 22 G01 X3 30i Join Date: Apr 2010 Location: Clayton, NC iTrader: (2) Garage List 2022 BMW X3 [9.83] 2015 BMW M3 [6.50]	The Dinan exhaust is an axle-back design - basically a muffler, and has nothing at all to do with emissions readiness. Your flash tune is the culprit, as mentioned above. __________________ 2015 F80 ///M3 Sedan 7DCT Tanzanite, 2022 X3 sDrive30i 8AT Brooklyn Grey
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05-25-2018, 08:01 AM	#6
Baruntse Enlisted Member 6 Rep 15 Posts Drives: 3013 335i Join Date: May 2018 Location: Glastonbury, CT iTrader: (0)	Thanks all for your help!I will give an update after a week or so.
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05-25-2018, 05:41 PM	#7
zinner Major 559 Rep 1,127 Posts Drives: `17 X5 35d/`15 335i/`18 M550IX Join Date: Oct 2014 Location: Raleigh, NC iTrader: (0)	There is no O2 heater so that will never complete. On the flash tunes the tuners have been bypassing the O2 sensor check (it completes), but the Cat effectiveness will never complete. Flash back to a stock tune once a year for a few days. Meanwhile all the diesels roll coal cause "work" trucks shouldn't pass emissions. rolls eyes (in NC) after all my ranting I realized you are a dinan users. Just keep driving, it takes a few days/drive cycles. It should complete assuming you are still stock emissions. Unless you have an emissions equipment issue.
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