Joshuamishler

So I'm working on a 2003 Audi a4 avant 1.8t, and it is throwing multiple codes. I am a mechanic but, not and audi mechanic. i have owned 3 1990 audi 90s but when it comes to the new ones im lost.
the codes are:
confirmed
p0501 Vehicle speed sensor A range/ performance
p0507 idle air control system revolutions mer munute higher than expected
p0300 multiple misfire
p0301 cylinder 1 mis
p0130 O2 sensor circuit bank 1 sensor 1
p0299 turbocharger / supercharger A underboost condition
p0304 cylinder 4 mis
Pending
p0322 icgition distributor engind speed input circuit no signal

now when i first scanned it i didnt get the p0322, p0300 and p0304. i started with changing coils and plugs to see if that would fix the mis. then i cleared the codes and it was good for the day, then the next day it was worse. I had more codes (all the ones above) and it started dying on me randomly while driving around town.

i have done some research and i get mixed answers. is it an exhaust leak, vacuum leak, pcv, i dont know. I dont want to start throwing parts at it and wasting money to not fix the issue(s) i feel like it is not as many issues and the computer thinks it is. If anyone has some ideas please help.

Prospeeder

Sounds like it need a crank sensor, a bank 1 primary oxygen sensor, the breather parts under the intake and behind the head are broken and need replaced, causing a big air leak. Thus the idle to high and the misfire codes.

Does the speedo work? It might just need a speed sensor if that code keeps returning.