A3 Wont Start

[dayofthejackal]

Recently bought a 2001 A3 (AUM). It had a lumpy idle so I replaced the MAF and seemed to cure it.
I gave it a service then it started to run badly at low revs, fine on turbo. Then it started to idle badly.
I plugged into VCDS and it showed misfire on cylinder 2 and coil ground problem.
I replaced the coil and it was still the same. I then noticed the coil wiring was cracked.
I replaced the coil wiring loom and at the same time simplified the breather pipes and fitted an oil catch can.
I came to start it and it wouldn't start. It turns over but nothing.
I plugged into VCDS again:

6 Faults Found:
17766 - Cylinder 2 Ignition Circuit: Open Circuit
P1358 - 35-10 - - - Intermittent
16396 - Bank 1: Camshaft A (Intake): Advance Setpoint not Reached (Over-Retarded)
P0012 - 35-10 - - - Intermittent
17705 - Pressure Drop between Turbo and Throttle Valve (check D.V.!)
P1297 - 35-10 - - - Intermittent
18010 - Power Supply Terminal 30: Voltage too Low
P1602 - 35-10 - - - Intermittent
17535 - Fuel Trim: Bank 1 (Mult): System too Rich
P1127 - 35-10 - - - Intermittent
16706 - Engine Speed Sensor (G28): No Signal
P0322 - 35-00 - -
Readiness: 0010 1101

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Address 08: Auto HVAC
Controller: 8L0 820 043 H
Component: A3 KLIMAAUT
Coding: 00041
Shop #: WSC 06435
Note: Excessive Comm Errors

 

[Lewis583]

You tried clearing the codes and cranking again? If not try that first.

If its still no good, go into measuring blocks and watch Engine Speed whilst cranking, if it reads 0 then crankshaft sensor/crankshaft sensor wiring will need further investigation.

 

[dayofthejackal]

Went to a test on the sensors and it started. The only thing different was I plugged the light switch plugs back in and put the lower dash panel back on. (had installed a boost gauge at the same time)