Codes popped up shortly following battery complete death & replacement. Active codes: 2BC0 Mixture control, fuel air mixture too lean - 36FD DME main relay, plausibility, prematurely dropped out - 387C Power management, battery total discharge (cleared and shouldn't come back) - 3887 vehicle voltage, working area: voltage too low (cleared and shouldn't come back) Shadow codes: 2C42 Mixture control, multiple fault - 2D45 Valvetronic, adjustment range, stop not taught in due to ambient conditions Notes: Driving, I can see small spikes in the AFR from 14.7 to 16.2 occasionally at bumper-to-bumper traffic speeds. WOT pulls hard initially, but felt like it tapered off weirdly - which is evident in the low peak boost numbers. On other logs I hit 18PSI, but typically I see 21 at max. Idle feels good, WOT just feels a little weak on the upper-range, slow driving is intermittently sluggish and choppy.