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      07-10-2019, 07:07 PM   #1
DeadlyDrop
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Drives: 2024 BMW M2
Join Date: Jun 2019
Location: Flagstaff AZ

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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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