Power problem
 

Hi, having problem here, hoping to get some help.
Driving car one day after new keys were cut and programmed at Audi for my 2001 A8, all of a sudden alternator light came on, then slowly ABS, Airbag, battery and all the lights came on, wipers were SOOOO slow and car started slowly dying on me, got a boost and started fine ran for a couple of minutes, then started putting and then died and wouldnt stay on, turned on but off couple of seconds. Towed it home did a vag-com and got this:

17526 - Oxygen (Lambda) Sensor Heating: B1 S2: Open Circuit
P1118 - 35-00 - -
17522 - Oxygen (Lambda) Sensor: B1 S2: Internal Resistance too High
P1114 - 35-10 - - - Intermittent
17978 - Engine Start Blocked by Immobilizer
P1570 - 35-10 - - - Intermittent
16946 - System Voltage Too Low
P0562 - 35-10 - - - Intermittent
18010 - Power Supply Terminal 30: Voltage too Low
P1602 - 35-10 - - - Intermittent
Readiness: 0010 0000

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Address 02: Auto Trans
Controller: 4D0 927 156 DF
Component: AG5 01L 4.2l5V USA 0507
Coding: 00012
Shop #: WSC 01117
1 Fault Found:
18158 - Supply Voltage too Low
P1750 - 35-10 - - - Intermittent

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Address 03: ABS Brakes
Controller: 4D0 907 389 E
Component: ABS/ESP allrad D46
Coding: 08397
Shop #: WSC 01117
2 Faults Found:
00532 - Supply Voltage B+
35-10 - - - Intermittent
00532 - Supply Voltage B+
07-10 - Signal too Low - Intermittent

Hoping something related to Voltage Regulator changed that and still the same, new battery and still not staying on, car turns on, runs nicely for 5 seconds then dies, try another time turns on, putts then dies as well...I checked these error codes on WIKI and conflicted if it is needing an ALternator replacement? Or cables, contacts, or is it immobolizer problem related to the new key change?
Please help...again car ran fine for 2 days after new key change then alternator light came on....help would be really appreciated....\\thanks yall