M5 Expert (>4000)
Join Date: Oct 2010
Location: Cobourg Ont
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How is that weird? If you have 15 then you will surely get 185 or other descriptor. It is possible to get the 185 alone but 15 never goes to the dance alone. For those that use hex he has B9 = 185, Exhaust camshaft VANOS position control, Cyl#1-4 and 0F = 15, Crankshaft/Camshaft position correlation, Cyl#1-4. BTW you should have included that info in your post.
No offense but you put little effort into finding the answer to this, albeit to find it on the board you need to convert decimal codes to hex codes but you should do that anyway because we use hex as default when "we are talking codes".
The answer to your question is you have a broken/shorted electrical path on one of the exhaust solenoids on bank one those are the ones on the left side looking from the rad or failed hydraulics. IE leaky noids or something else and you will not find out until you bench test the boards.
I will say the odds are highest because of the two code combo that you have a failed or broken off diode/Mov controlling one of the exhaust solenoids.