prestonian

I searched the forum and it appears that the following pressure sensor can go bad:
4H0-959-126-A Pressure sensor
I have pulled codes, and nothing thrown.
Anyone know if a code should be present if this sensor has failed?
I also bought some Freon in the event it is a bit low.

Thanks,
2012 A6 3.0

payedmercenary

On my A6 the AC pressure sensor failed and didn't cause any codes. After a few hours of diagnosing the issue I finally replaced the AC pressure sensor as a last ditch effort and it completely fixed the problem. Luckily it is extremely easy to replace. Just pull the plastic cover that covers the cavity between the bumper and the radiator and it's on the right side. For some reason mine was loose and was able to be unscrewed by hand which may be the reason it failed.