OK, So I've had NO AC this entire summer and I'm from DC so it's not pretty. I finally was able to get some fault codes thanks to a new friend, and I'm looking for anyone's advice on how to correct it.

Problem:
ECON light stays on and there is no AC. Fan Blows well, but just no compressor action. Cannot turn ECON light off.

Fault Codes:
17522 - Oxygen (Lambda) Sensor; B1 S2: Internal Resistance too High
P1114 - 008 - Implausible Signal - Intermittent
00819 - High Pressure Sensor (G65)
29-00 - Short to Ground

Clues:
1.) The VAG-COM is reading a 1.0 pressure of FREON which is strange because I have an external guage which reads it as full. I even let FREON out, which came out under pressure, and refilled it again (with engine running), so I believe that is a false reading.
2.) AS STRANGE AS THIS SOUNDS, I can get the AC to work if I drive for exactly 20 minutes, then immediately park for exactly 5 minutes. When doing that first drive of the day I have COLD COLD AC for upto an hour and a half until I park the car for an extended period of time!

Diagnosis:
I think my first bet is to replace the High Pressure Sensor. However could it be something else? Anybody have any experience with any of these issues?!?

 

Anybody? If it helps its a 2002 audi a4 1.8t....