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Old 05-09-2021, 12:01 AM
Leghab Leghab is offline
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Join Date: Nov 2019
Location: New england
Posts: 6
Leghab is on a distinguished road
I've only got through five pages so far, but I have a few thoughts on why you don't have a CEL.

It's called the EU2 flash. I've seen this done by people before - they flash the Euro 2 tune, which removes the CEL-on conditions for all emissions-related errors. Unfortunately, it also removes the CEL-on condition for... well, everything.

Another thing that I thought of was related to your misfire. In my X5, I had many of the same issues - it would be intermittent, even after changing the plugs and coils.

I eventually chased it down to the DME itself. Seems there is not a very good weather seal around the DME box. Once I replaced that (any used MS43 DME will do, then you can eliminate the EWS) it was fine again.
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2006 BMW X5 3.0 6MT, "Sterlingfrau" or "The Grey Lady." 245k. Tow Vehicle and Daily Driver.
1991 BMW 318iS 5MT. "Dog." Fully sick, custom, rattlecan paintjob. Rallycross car.
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