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Old 09-13-2021, 12:13 AM
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Join Date: May 2021
Location: New York, USA
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Fuel Trim Code 3.0i M54

Hi, I am getting a code for my fuel trim.
E4- Lambda regulator deviation bank 2.

I had a code last winter saying both fuel trims were running rich based off a generic scanner that I had at the time.

The car misfires a little on cold start but it lasts a fraction of a second. I would misfire (as it sounds to me) for literally half a second then all good but only when cold. The car runs fine just this code that surprised me yesterday. I took apart all of the intake boots and non were cracked. I replaced the one going to the throttle body and ICV a while back and while I was at it I checked the DISA and cleaned both the Throttle body and ICV.

What are your thoughts?
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Old 09-13-2021, 07:01 AM
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Join Date: Apr 2019
Location: Boston, MA
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You CAN diagnose this on your own, but it is a little tricky with a steep (not quick) learning curve. A great tool for this is called OBDFusion which is a phone app. You also need a wireless OBD2 reader.

Here is an excellent post from the E46 crowd:
https://www.e46fanatics.com/threads/obd-fusion.1240733/

If you are running lean, it's usually due to a vacuum leak and there are literally maybe 12 different ways you can have a vacuum leak on an M54...a rip in an intake boot is an obvious one...But a smoke test is a good way of finding vacuum leaks.

If you are running rich, It could be a bad MAF sensor or leaking fuel injectors, or too much fuel pressure...But don't just throw parts at it.

I saw your other post regarding a sunroof repair. You should find a competent non-dealer specialist and just pay the man to figure out your fuel trims.
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