Alright I bought a 2001 a4 1.8 turbo. The check engine light came on today so I hooked up the scanner and got 6 codes.

PO321- ignition/dist engine speed input CKT range/perf
PO172- System to rich (bank 1)
PO300- Random/ Multiple cylinder misfire
PO301- Cylinder 1 misfire
PO302- Cylinder 2 misfire
PO304- Cylinder 4 misfire

Can anyone give me an idea on what this might be or where to start to narrow the possiblities down? I am brand new to Audi's please help. I am mechanically inclined and can't afford to take it to the dealer. Thanks for all the help

 

clear them and see if any come back