Battery light on

[BladeX5]

Hi guys,

It's been a while since my last post, but now I'm confused with some electrical gremlins that started happenning in my X5 4.4 in the last trip to the shop.

I sent it over to my mechanic to change guides, chain, gaskets, etc, as preventive maintenance and in hope to reduce the noise made at startup and the diesel clatter when warm.

Well, my guides weren't that bad yet, but still we opted out to change them anyway, I bought them already anyways. The noise still persist at startup and warm, meaning probably Vanos issues (no codes yet), but that's not the part I'm worried about.

The thing is that it came with the battery light on, no flickering, no off anytime, just on all the time. I personally repaired the alternator myself (water cooled) with oem parts Bosch brand about 7 months ago also as preventive maintenance, it was ok before the last visit to the shop, and still is charging battery correctly, measured through OBC option, with digital voltimeter and with oscilloscope, there is no issues I can find, and worst part is that neither INPA, ISTA-D, or a good bmw scanner is able to find anything at all related. There are no codes at all!!!!

Car performs well, voltage is sustained at 13.6-14.4 Volts while running.
I have no clue of what's going on.

Can someone give me a hint of what might be going on? The shop owner told me they couldn't find anything wrong with voltage either, and it's being a month or so since I picked her up.

I'm pulling my hair with this electrical issue.

Please help!!!