I have a 98 A4 2.8 and the engine light has been on for sometime now and when I have pulled the codes it comes up with 10-12 codes 2 or 3 for each O2 sensor and then some other codes that wouldn't let the car operate. The car runs well but was wondering what may cause so many codes to trip. I have not done any modifications to the car either.

I am also having issues with my AC unit not constantly pumping out cold air. It will be cold then when I stop at a red light it goes pumps out warm muggy air. I live in FL and that is no help this time of year. Do I need to have the AC unit looked at or is it something else?

Just this past week I was driving and the oil light came on and blinked three or four times then shut off. I stopped and checked and have plenty of oil in the car. The car has been running a little warm for the past week as well.

Just trying to get a idea of what to expect when I take it into a shop this next week or to see if there is anything I can do at home.