I have a 1998 Audi A4 Quattro with the 2.8L V6 30v
232xxx miles
manual transmission

I am running 7 check engine codes and a couple lights on the dash
The codes are:
P0134 - O2 sensor
P0300 - multiple misfire
P0301 - misfire cylinder 1
P0302 - misfire cylinder 2
P0303 - misfire cylinder 3
P1136 - system too lean
​​​​​​P1138 - system too lean

The lights on the dash are:
Check engine - solid
ABS - solid
Airbag - solid
Brake - flashing

When I got the car, the guy told me that the misfire codes were from the valve cover gasket leaking oil into the spark plugs. I haven't tried replacing the plugs or gasket yet but I will once I get the funds. If anyone has any knowledge on misfire codes, lean codes, lights on the dash, or anything, please let me hear it and give me advise to fix this car. Anything is greatly appreciated.

 

Well the misfire codes are obvious. If you want them cleared, I’d spray some brake cleaner down the plug tunnels (with the spark plugs in) and blow it out with some compressed air to get the oil out, change the plugs and clear the codes and see if they stay away.

I would also recommend getting a cheap eBay cable and get the freeware of VCDS. That way you can scan the whole car and not just the ECU. A blinking brake light and solid ABS usually means the ABS unit is done.

For the airbag light, you may need a registered version of VCDS to clear it or even scan that module. I can’t remember. It will tell you what exactly is wrong.