AC Issues

[Whitee]

Just got my VCDS and scanned my car. Have a few pictures showing the codes. I replaced my A/C Pressure switch last night and the car still doesn’t blow cold at idle, only while moving.

Does this point to an electrical issue of some sort of I replaced the sensor and it’s still not working? Any input would be appreciated.

Apparently I can’t post a link with the new iPhone .

Two codes 00256 Implausible Signal to AC Pressure Sensor

01592 Air Quality Sensor No signal/Communication

Here is the information:


Address 09: Cent. Elect. Labels: 8K0-907-063.clb
Control Module Part Number: 8K0 907 063 P HW: 8K0 907 063 P
Component and/or Version: BCM1 1.0 H25 0380
Software Coding: 26001091063CAF010000080300003D0D4F1C52080001016100 0000
Work Shop Code: WSC 06325 123 12345
VCID: 3C21375D16620AB782D-8068
4 Faults Found:

03020 - Local databus 2
012 - Electrical Fault in Circuit
Freeze Frame:
Fault Status: 01101100
Fault Priority: 2
Fault Frequency: 96
Reset counter: 195
Mileage: 155360 km
Time Indication: 0
Date: 2018.09.09
Time: 20:24:00

00256 - A/C Pressure/Temperature Sensor (G395)
004 - No Signal/Communication - Intermittent
Freeze Frame:
Fault Status: 00100100
Fault Priority: 3
Fault Frequency: 3
Reset counter: 234
Mileage: 155372 km
Time Indication: 0
Date: 2018.09.10
Time: 09:48:00

01592 - Air Quality Sensor (G238)
004 - No Signal/Communication - Intermittent
Freeze Frame:
Fault Status: 00100100
Fault Priority: 3
Fault Frequency: 1
Reset counter: 234
Mileage: 155372 km
Time Indication: 0
Date: 2018.09.10
Time: 09:48:00

01592 - Air Quality Sensor (G238)
008 - Implausible Signal
Freeze Frame:
Fault Status: 01101000
Fault Priority: 3
Fault Frequency: 1
Reset counter: 234
Mileage: 155372 km
Time Indication: 0
Date: 2018.09.10
Time: 10:12:00


Address 08: Auto HVAC (8T1 820 043 AQ)

20:04:30
ERROR Refrigerant Pressure (G395)
3.0 Compr. Shut-Off Request
19.0°C Outlet Temp. Evaporator (G263)
ERROR Air Quality Sensor (G238)
ERROR Refrigerant Signal

From my understanding, if the sensor reads below 1.8Bar than the system throws a fault. Could getting the system refilled take care of this, or is it def related to wiring? I noticed on my old sensor it had white residue on it which leads me to believe it was leaking....





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[Whitee]

Ran the block scans based on the Ross Tech help information which is posted at the bottom.

[Whitee]

Anyone?


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[Whitee]

Sorry guys for being annoying but does anyone know where to go from here? Would like to get this taken care of. I can hear a loud hissing on a cold start that goes away after the sai warm up is done. I’ve also seen where the high pressure switch could be the culprit?


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[14S4GWM]

Did you clear all the codes after the install?

[Whitee]

Did you clear all the codes after the install?

Yes I did. Same ones came back.


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[DFS4]

I had the same issue although possibly not the same cause. My 8.5 would not blow cold at idle, only when moving, also the fans would operate intermittently . I found that a loose connector was the cause. I snapped the connector back together and all was good. The connector is located under the plastic cowling that covers the brake reservoir.
hope this helps

[Adamantium]

What pressure sensor did you put in? I had to change the one on my A5 and read hundreds of threads about it first m. Many pointed to the replacement not working when using the exact same part number but a slightly older revision than they should have - usually due to buying on eBay.

[Whitee]

What pressure sensor did you put in? I had to change the one on my A5 and read hundreds of threads about it first m. Many pointed to the replacement not working when using the exact same part number but a slightly older revision than they should have - usually due to buying on eBay.

I got it from fcpeuro


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