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Old 05-09-2021, 12:01 AM
Leghab Leghab is offline
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.
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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