A/C NOT WORKING 2009 A4. Please see fault codes posted. Will not take charge! HELP!!!

[colton14]

I have been working on my a/c for several days now and no luck getting it to work. I still have the three fault codes posted below and I am hoping someone has seen this sequence before and can tell me what to do as I am sick of trial and air. The compressor was not getting power but I unplugged it and plugged back in then BOOM, the clutch engaged. I thought it was that so I then had y shop try to re-charge and after confirming no leaks, the re-charge stopped at .64 oz. Upon returning home, I re-scanned and still have the same three codes. I'm assuming I need to replace the high pressure sensor but even if it is faulty wouldn't it still take a full charge. We also re-filled through the low pressure so how would the sensor effect this in anyway. Any insight would be much appreciated!! Codes are below.

Address 08: Auto HVAC Labels: Redir Fail!
Control Module Part Number: 8T1 820 043 T HW: 8T1 820 043 T
Component and/or Version: KLIMA 1 ZONE H06 0150
Software Coding: 64002000
Work Shop Code: WSC 02391 823 56573
VCID: 4281773FDD7DA73138B-8017
3 Faults Found:

00256 - A/C Pressure/Temperature Sensor (G395)
002 - Lower Limit Exceeded
Freeze Frame:
Fault Status: 01100010
Fault Priority: 2
Fault Frequency: 2
Reset counter: 66
Mileage: 115158 km
Time Indication: 0
Date: 2015.07.02
Time: 19:56:06

Freeze Frame:
Temperature: 42.0°C
Temperature: 91.0°C
Load: 0.0 %
Absolute Pres.: 0.4 bar
RPM: 0 /min
Speed: 0.0 km/h
Current: 0.000 A
Temperature: 39.0°C

00457 - Control Module for Network (J519)
013 - Check DTC Memory - Intermittent
Freeze Frame:
Fault Status: 00101101
Fault Priority: 6
Fault Frequency: 4
Reset counter: 106
Mileage: 115172 km
Time Indication: 0
Date: 2015.07.02
Time: 21:32:56

00256 - A/C Pressure/Temperature Sensor (G395)
008 - Implausible Signal - Intermittent
Freeze Frame:
Fault Status: 00101000
Fault Priority: 7
Fault Frequency: 4
Reset counter: 106
Mileage: 115172 km
Time Indication: 0
Date: 2015.07.02
Time: 21:32:56

Freeze Frame:
Temperature: 31.0°C

Thank you!!!

[van462]

I believe there is an updated G395. I have read of several failures of this part to where it even leaks thru the sensor and into the electrical connector.

http://www.audizine.com/forum/showth...highlight=g395

If the systems sees a low pressure condition it turns off the compressor to prevent damage. Servicing most A/C you have the system set to max cold with the engine (compressor) running. If the system is not sensing the low side pressure rise it won't turn on the compressor to allow the rest of the fill to happen.