Got my x5 back yesterday after dealer put in new SCR and rear Nox sensor. Drove it 10 miles and CEL came back on. I crossed my fingers for the active tank so it would all be covered under warranty... unfortunately it was not. Dealer scanned it for free and reported an EGR vacuum code and injector 6 activation. They offered to fix it... but I drove it home. On the way, I watched the engine temp and at 60 mph it sat at 68 C.

So, from the temp being 20 C lower than it is supposed to, I'm assuming that could be why the SCR was ruined so quickly. Amazing that this egregious value wasn't detected while being worked on. Planning to purchase Thermostat 11517805811 from ECS for 60 dollars. I've read conflicting information regarding a thermostat for the EGR. More on the EGR in a minute.

Today I got ISTA+ to work! So excited. Literally poured over the search function at Bimmerfest until I found why my connection to the car wasn't working. Once it was connected, it didn't even finish going through all the modules before my low battery dinged. Is this normal? Could a bad battery cause a bunch of alarms? The alarms which were stored are as follows:

478E DDE: Low-pressure exhaust-gas recirculation valve, plausibility
47C4 DDE: Low-pressure exhaust-gas recirculation controller, position control
47C9 DDE: Low-pressure exhaust-gas recirculation controller, position control
4BD9 DDE: Injector, cylinder 6, activation
4F6F High irregular rotation
6F8C Message (footwell module, 0x1E1) missing, receiver DSC, transmitter footwell module
9D00 FZD: Emergency-power siren: communication fault

If these forums didn't exist, I would have already sold this vehicle and lost thousands to avoid losing thousands more. Thanks to everyone that has ever posted in the forums, and those that will help me even more.