No start 2000 A6 2.7t

[Radek]

Greetings Audifans;

Looked today at a potential buy - 2000 A6 2.7 turbo 6-speed, 153k miles.  The car has been sitting in the underground garage for the entire winter, probably longer (one tire is flat, another one half-flat).  The battery is completely dead, no lights come up on dashboard.  When boosted, does not turn over, only slight clicking can be heard, like a relay.  Definitely not the bendix.  Feels like something is preventing the car from starting.

VAG-COM shows the following codes:

5 Faults Found:

17539 - Oxygen (Lambda) Sensor; B2 S1

     P1131 - 35-10 - Internal Resistance too High - Intermittent

17861 - Exhaust Gas Temp Sensor 1 (G235)

     P1453 - 35-10 - Open or Short to Plus - Intermittent

17865 - Exhaust Gas Temp Sensor 2 (G236)

     P1457 - 35-10 - Open or Short to Plus - Intermittent

17521 - Oxygen (Lambda) Sensor; B1 S1

     P1113 - 35-10 - Internal Resistance too High - Intermittent

18010 - Power Supply Terminal 30

     P1602 - 35-00 - Voltage too Low

Readiness: 0000 0000



Any idea where to start?  I'm at a loss here, not being used to modern electronic controls.  The car needs to get out of the garage under its own power, no flatbet can get there.  

TIA



Radek.

91 V8Q 5-sp