@udi4.qwick

This is what I got after I scanned with vag-com last night:

Chassis Type: 4B - Audi A6 C5
Address 01: Engine
Controller: 4D0 907 560 AE
Component: 4.2l V8/5V G 0003
Coding: 07752
Shop #: WSC 02325
xxx xxx
3 Faults Found:
17549 - Load Calculation Cross Check: Implausible Value
P1141 - 35-10 - - - Intermittent
17539 - Oxygen (Lambda) Sensor; B2 S1: Internal Resistance too High
P1131 - 35-10 - - - Intermittent
17819 - Secondary Air Injection System; Bank 2: Insufficient Flow
P1411 - 35-00 - -
Readiness: 0000 0000

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Address 35: Centr. Locks
Controller: 4B0 962 258 J
Component: Central Lock/Alarm D34
Coding: 15981
Shop #: WSC 02325
7 Faults Found:
01371 - Alarm triggered by Door Contact Switch; Driver's Side
35-00 - -
01374 - Alarm triggered by Terminal 15
35-00 - -
01370 - Alarm triggered by Interior Monitoring
35-00 - -
00955 - Key 1
09-10 - Adaptation Limit Surpassed - Intermittent
01559 - Drivers Door
58-10 - Can't Lock - Intermittent
01562 - Right Rear Door
58-10 - Can't Lock - Intermittent
01574 - Alarm triggered by Door Contact Switch; Right Rear
35-00 - -

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Address 45: Inter. Monitor
Controller: 4B0 951 178 A
Component: Innenraumueberw. D04
Coding: 00101
Shop #: WSC 02325
1 Fault Found:
01349 - Alarm via Theft Warning System; Front
35-00 - -

Bracketracer

P1141 - likely due to a failing air mass meter, however, I find it odd that you didn't come up with any fuel trim codes
P1131 - replace the left front oxygen sensor (drivers)
P1411 - possible vacuum leak in the vac source to your left combi-valve, or a problem with the combi valve itself. I wouldn't suspect an issue with the secondary air solenoid valve or the air pump itself, since the fault is only showing up on the left bank

Don't worry about the alarm or interior monitoring codes. I have yet to scan an Audi that didn't have at least one code in both of those addresses