Dealer recall work, caused other issues, not taking responsibility

[Davidf]

I just hate dealers. I normally do all maintenance work myself but had to take my '08 4.8i in for fuel pump and passenger airbag recall work. Car was working perfect when we dropped it off. My wife picked up the car and immediately texted me about multiple faults:

Active Steering
DSC
4x4
Backup camera

Dealer had said the battery was weak and they had multiple module "glitches". Why did the dealer even code the vehicle for airbag and fuel pump. Did they remove the drivers airbag to replace a temporary repair under recall?

I changed the battery for good measure, no improvement. Dealer is know blaming all the issues on battery registration. I think we all know that is BS.

Here is service manager response to my inquiry...car is back with them;
"Thank you for your patience while we look further into the X5. My shop foreman is diagnosing the car as the tech that recently worked on the vehicle is off today. He stated there are multiple under voltage faults related to the need of and exchanged battery. Also there are emissions faults for a crank case ventilation valve. When he returns from lunch he will attempt to register the aftermarket battery, and re-calibrate the steering angle sensor. Those issues are related to the voltage concern and there is a possibility they can be remedied with battery registration and sensor re-calibration. For the faults with the crank case vent valve he will determine the need for replacement and provide an estimate to which I will contact and discuss with you as needed. Thank you for your patience and I will get in touch with you soon with the details"

What say you? Has anyone ever heard of low voltage messing with steering angle sensor calibration. It seems to me all the above faults can be blamed on steering angle sensor calibration or fault. Even the right turn signal won't self cancel now.

Did i say I hate dealers?