I have a 2000 Audi A6 I barely drive it, it has 90,000 miles on it and I live in Florida.
Now every now and then the check engine light comes on and I have a OBD 2 reader which states "Engine Temp High Out put" but my temp is fine so I erase the code and it comes back maybe 2 weeks later. Now all of a sudden my oil lamp flashes, my ABS light stays on my BRAKE light flashes my RPMS dont register and the AC blows hot I don't hear engine noises and after a few miles it goes off and every including the Ice cold AC goes back to normal.
Please help I have knowledge of auto repair but I don't wanna guess or be ripped in half by a mechnaic or dealer simply because its an AUDI and they assume I can afford the repairs.
Thanks in advance.

Optional Information:
2000 Audi A6 2.8 liter

Already Tried:
Nothing