Fault 00256 No AC? AC Pressure Switch?

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09-28-2018, 06:10 PM
mys4.org

Fault 00256 No AC? AC Pressure Switch?

On the way to Costco I noticed my AC was not working in my 2013 S4. So in the parking lot I scanned it with my OBDEleven and got a 00256 code. I know this same sensor went bad on me when I had my B5 S4 and it was a pain to replace. So my questions.... and I'm have a heck of a time finding good answers via searching:

1. What is the part number for the AC pressure sensor? FPC Euro listed: 4H0959126A, 4H0959126B, 4H0959126

2. Second, where is this sensor located? Is is behind/below the front driver side headlamp? Anyone have pictures of where it is located?

https://uploads.tapatalk-cdn.com/201...00cb83a601.jpg
09-29-2018, 01:16 AM
Clowny

I'm not going to be able help as I've got the same problem and found nothing by searching either, so I'm subbing to hopefully get answers too!

Although mine is 2010 Avant.

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09-29-2018, 01:44 AM
Adamantium

Had this go on my rhd A5. Yes next to left side headlamp.

Removed panel over rad and top of lights with four screws and installed using a deep socket. Can’t remember which but it was big -22mm maybe.

Lost a tiny bit of AC gas when unplugging but it is valves.

Replaced and refit and it worked a charm.

Read some horror stories of the eBay purchases appearing to be almost identical pn but it working. I paid £65 from dealer as they had in stock. Swap took 10 mins of that.
11-16-2020, 08:05 PM
coop3422

Quote:

Originally Posted by mys4.org

On the way to Costco I noticed my AC was not working in my 2013 S4. So in the parking lot I scanned it with my OBDEleven and got a 00256 code. I know this same sensor went bad on me when I had my B5 S4 and it was a pain to replace. So my questions.... and I'm have a heck of a time finding good answers via searching:

1. What is the part number for the AC pressure sensor? FPC Euro listed: 4H0959126A, 4H0959126B, 4H0959126

2. Second, where is this sensor located? Is is behind/below the front driver side headlamp? Anyone have pictures of where it is located?

https://uploads.tapatalk-cdn.com/201...00cb83a601.jpg

Old bump, but did this fix your problem OP?

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