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      07-10-2019, 07:07 PM   #1
DeadlyDrop
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SOLVED! N55 - Emissions Shop Can't Communicate with ECU - New Owner (STL)

Hello.

New owner of 135i.

Car has aftermarket downpipe with chargepipe installed.
It currently does not throw CEL light.

Found inspection station where they basically cheats OBD2 emission readiness test. All the emission parameter is ready but for some reason it does not pass emission. Did drive cycle again and still no luck.

Shop says emission system can not communicate with car's computer.
They are suggesting maybe car is tuned.

But there is no sign of JB4 or other piggyback tune installed.

Will attach carista emission scan result one before going to shop and after going to shop.

UPDATE: Problem finally solved! It turns out that previous owner had MHD stage 1 plus tune. It doesn't make sense because car has downpipe and with downpipe you can advance to stage 2 right away. Anyway, purchased MHD app from google store and reverted it back to stock and everything is good now! Never been this happy to see CEL light haha.

Thank you all for helping me out!!
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Last edited by DeadlyDrop; 07-13-2019 at 07:22 PM..
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      07-10-2019, 08:04 PM   #2
The Wind Breezes
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Can't communicate with computer usually means JB4 is installed. It's probably in invisible mode or whatever and they didn't bother to check the wiring loom. Or you have a flashtune that locked the OBD port.
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      07-10-2019, 10:17 PM   #3
DeadlyDrop
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Quote:
Originally Posted by The Wind Breezes View Post
Can't communicate with computer usually means JB4 is installed. It's probably in invisible mode or whatever and they didn't bother to check the wiring loom. Or you have a flashtune that locked the OBD port.
Thank you for your reply!

I looked through engine bay and i cant find jb4 module anywhere..
Is it possible that flash tune such as MHD tune can prevent it from reading ECU?

I also tried pressing down arrow and volume down button at the same time and it still doesn't do anything. So I believe chance of having JB4 is low.

But still thank you so much!
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      07-11-2019, 10:55 AM   #4
Elboz08
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I just had my car smogged while still on the MHD 2+ tune. I had the Cat still installed tho.
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      07-12-2019, 08:19 PM   #5
TM9030
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My car had the same issue...I found out the previous owner had flashed the car with an MHD tune.

It's weird, I've read that some people have no issues passing smog with an MHD tune, but some do.
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      07-12-2019, 08:26 PM   #6
DeadlyDrop
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Quote:
Originally Posted by TM9030 View Post
My car had the same issue...I found out the previous owner had flashed the car with an MHD tune.

It's weird, I've read that some people have no issues passing smog with an MHD tune, but some do.
I think its MHD, going to flash tonight and see where it takes!
But at this point it looks like its MHD forsure.
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      07-13-2019, 07:59 PM   #7
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I think its MHD, going to flash tonight and see where it takes!
But at this point it looks like its MHD forsure.
Was MHD the problem?
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      07-13-2019, 09:22 PM   #8
DeadlyDrop
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Quote:
Originally Posted by TM9030 View Post
Was MHD the problem?
Yes it was! Apparently car had stage 1+ tune on it. MHD was preventing emissions from communicating with ECU. I restored everything back to stock thru MHD flasher app. Now car shows CEL light for cat and everything. Ready for inspection!
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