my a6 4.2 for the first time will not start. it has 205k on it and here are the codes that I have:
17831 - Secondary Air Injection System; Bank 1: Insufficient Flow
P1423 - 35-10 - - - Intermittent
17819 - Secondary Air Injection System; Bank 2: Insufficient Flow
P1411 - 35-00 - -
17549 - Load Calculation Cross Check: Implausible Value
P1141 - 35-10 - - - Intermittent
17640 - Fuel Injector for Cylinder 8 (N86): Short to Ground
P1232 - 35-00 - -
17633 - Fuel Injector for Cylinder 1 (N30): Short to Ground
P1225 - 35-00 - -
17636 - Fuel Injector for Cylinder 4 (N33): Short to Ground
P1228 - 35-00 - -
17637 - Fuel Injector for Cylinder 5 (N83): Short to Ground
P1229 - 35-00 - -
17635 - Fuel Injector for Cylinder 3 (N32): Short to Ground
P1227 - 35-00 - -
17638 - Fuel Injector for Cylinder 6 (N84): Short to Ground
P1230 - 35-00 - -
17634 - Fuel Injector for Cylinder 2 (N31): Short to Ground
P1226 - 35-00 - -
17639 - Fuel Injector for Cylinder 7 (N85): Short to Ground
P1231 - 35-00 - -
if any one has any idea where I need to start looking. thanks

 

Maybe try replacing the Fuel Pump Relay.

I had the following codes on my 1998 A3 1.8 petrol (AGN), and replacing the fuel pump relay fixed it. Apparently this provides power to all injectors etc as well as the pump. £10 from a motor factors.

Control Module Part Number: 06A 906 018 AK
Component and/or Version: 1,8l R4/5V MOTR HS V02
Software Coding: 04000
Work Shop Code: WSC 06313
7 Faults Found:
01249 - Fuel Injector for Cylinder 1 (N30)
29-00 - Short to Ground
01250 - Fuel Injector for Cylinder 2 (N31)
29-00 - Short to Ground
01251 - Fuel Injector for Cylinder 3 (N32)
29-00 - Short to Ground
01252 - Fuel Injector for Cylinder 4 (N33)
29-00 - Short to Ground
01247 - Activated Charcoal Filter (EVAP) System Solenoid Valve 1 (N80)
29-00 - Short to Ground
17923 - Intake Manifold Valve (N156): Short to Ground
P1515 - 35-00 - -
17935 - Camshaft Timing Adj. Bank1 (N205): Short to Ground
P1527 - 35-00 - -