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I have an E39 as well and agree with you about O2 codes but I think if the CPS were the problem, it would trigger a specific CPS error. The one thing that makes me think it is the O2 sensor this time is that the mis-fires are showing up in cylinders 4-6 only, which is the same cylinders to which the failing O2 sensor supports. I'm hoping the part arrives today so that I can replace it tonight.
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2013 Audi TT RS (Tech Pkg, Sport Exhaust, Heated Seats, Sirius)
Retired--2007 Z4 M Coupe (Imola Red/Black, Premium Pkg, Heated Seats, XM, Bimmian stubby antenna, CDV delete, Apex EC-7--Anthracite, Goodyear F1 Asymetric 2.
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