Advice needed...Shes a dozy

[4theloveofaudi]

Looking into purchasing a 2009 B8 A4, 2.0

Its shooting out codes :
U111300- Function Limitation Due to Received Malfunction Value (x2) Googling says it could be a brake sensor?
P308800- Starter Relay Electrical Malfunction In circuit
P305400- Starter does not turn mechanically blocked or electrical malfunction
p035300- Ignition coil C primary/ second circuit
p229400- Fuel pressure regulator 2 control circuit
p050600- idle control system rpm lower than expected
P030300 through 30400- misfiring on all 4
p130a00- Hide cylinder (hide it where and why lol)
p068a00- ECM,PCM power relay Deenergized performance too early
p217800- cold start ignition timing performance
p217800- system too rich off idle bank 1
p010200- mass or volume air flow circ. low input
p010000- mass or volume air flow circuit
p003000- o2 sensor heater control circuit bank 1 sensor 1
p030000- random/multiple cylinder misfire detected
p011300- intake air temp circuit high input
p056200- system voltage low voltage

Yeahp, i know its a lot happening here.
The car was given to a friend so we don't know its backstory, at all. All we know for certain is it needs a new turbo and obviously spark plugs/coils. It starts but only idles for 40 seconds before the audible misfiring starts and then she shutdown..
The asking price is dirt cheap...cheaper than even any shit box, that Ive come across, on the market.
You guys think its worth saving with the help of a former, non Audi/VW mechanic

[Smac770]

Is all of that just been there, or have you already cleared codes and this is what's coming back new? Are you using VCDS? It would make a more intelligible and complete scan log.

Could be wiring or fuses for some of that. You'd want to validate all the fuses in the ECM box. Those fuses power things like the MAF, the coils, the O2 heaters, etc. Could be the ECM too. But you just have to pick something and work through that object.

Did you monitor the fuel pressures after start to see if they are steady at 4 MPa if normal idle, or above that if high idle. The engine does up to 60 seconds of a high idle (~1200 rpm) on cold start for cat warm up. The P2294, but without any of the freeze frame data, who knows what scenario that code tripped.