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Air Con Pressure Temp Sensor location

Discussion in 'Audi S4/A4/A4 Cab (B8 Chassis)' started by johno5, May 8, 2013.

  1. johno5

    johno5 New Member

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    Can any one tell me where the G395 A/C Pressure Temperature sensor is ,as I've just done a Re gas on my (B8) 2008 A4 2.0 TDI & it threw up all sorts of codes referring to this part. After the Re gas the air con is still not working.
    I have also found on the net a Technical bulletin from Audi referring to this being a problem with the A4, A5, & S5 as there is also a LIN (Bus Data) cable that connects this sensor to the control unit that may get pinched / broken.
    Has any one heard of this happening ??
     
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  3. jfordy84

    jfordy84 New Member

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    Hi johno5

    Did you ever find a solution to this. I have the same problem with the data bus cable and the above mentioned sensor causing problems (implausible reading I think)

    Cheers
     
  4. shermand100

    shermand100 New Member

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    Hi all, first post here so trying to make myself useful, rather than just a bid for someone else to help. There's quite a bit of info online about this, (location etc) but a few details missing so I'll share how far I've got.

    Background:
    A/C didn't work and when I did my yearly service, so plugged in my VAG scanner and was surprised to find quite a few codes...

    08 Auto HVAC 00256 A/C pressure Temperature Sensor (G395) Sporadic 008 - Implausible signal
    00457 Control Module for network (J519) Sporadic 013 - Check DTC Memory
    01592 Air quality sensor (G238) - sporadic 004 No signal/connection
    09 Cent Elec 03020 local data bus 2 - sporadic 012 - electrical fault circuit

    and some other most likely unrelated door issues.

    And whilst searching for answers came across an Audi technical bulletin that sums up our problems (do a google search for 2020124-2, the pdf file titled Air conditioning inoperative was a massive help.

    So i inspected the sensor and did not see any corrosion.

    Today I took it for a A/C service and recharge at a Halfords Autocenter for £49, and left the panel that covers the sensor off so they could see if it leaked as expected in the Audi technical bulletin (although because of the good condition of the sensor I didn't expect it to leak)...

    It leaked

    It was hissing from the G395 pressure sensor and so they drained the gas.

    They drained the system and now it's back on the drive again. So I've taken it apart to see if it's corroded inside making the most of knowing there's no pressure in it. It's these pictures I hope are useful for others as I've not seen them anywhere else.

    These pictures show the valve that sits under the sensor, so it should be safe to change under pressure. It also tries to show the oily residue from where it leaked inside the connector. It appears to have crept around and past some of the pins.

    The bumper did not need to be removed. Just required a 17mm spanner. less than 10min job to replace.

    So I'm weighing up my options: -

    Replace myself (Part from Ebay £30 from china (by part number listed in the technical bulletin mentioned in this post), and then another £49 for halfords to recharge the system. (but maybe it or something else will leak?) all in £79 if all goes well.

    Or Audi £61 for the sensor + £3 for new 0-ring. Audi also quoted me £80 for labour ontop of that, and then £79 ontop of that again for the aircon recharge. (get a 2 year warranty on it though) £223 all in, if all goes well.

    Halfords will get back to me on monday with their price.

    Thats my experience with the problem so far, hope it helps someone. Likewise if anyone has any advice for me or can shed some experience it would be appreciated.

    Cheers, Dan

     

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  5. Gooders

    Gooders Member
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    Good write up dude should help us if we get same snag


    Sent from my iPad using Tapatalk
     
  6. B5NUT

    B5NUT Well-Known Member
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    Get a new genuine sensor & o-ring and fit yourself, don't be tempted the get the cheap one or reuse the old o-ring, it's surprising how quickly the cost can mount up regassing the aircon system.

    For the sensor see if there is a local TPS center near you that could save you a few quid on the parts. You have already removed the sensor so I would not pay the extra £80 that Audi want. Also put the damaged sensor back on while your driving the car around you don't want dirt getting into that sensor socket.
     
  7. shermand100

    shermand100 New Member

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    Thanks for that B5NUT. That was my thinking too. Saw the first leak as fault finding really.

    It's now fixed. Sourced the new sensor (and new O ring) from Audi for £63. The new sensor differs from the old one slightly. It has a black top and takes a slightly bigger spanner but not problems to fit, very easy. And was recharged no problems for £45 from a garage down the road.

    At last lovely cool air!!

    For those with the same problem I can confirm that in my case the new part has cleared the codes

    08 Auto HVAC 00256 A/C pressure Temperature Sensor (G395) Sporadic 008 - Implausible signal
    00457 Control Module for network (J519) Sporadic 013 - Check DTC Memory
    01592 Air quality sensor (G238) - sporadic 004 No signal/connection
    09 Cent Elec 03020 local data bus 2 - sporadic 012 - electrical fault circuit

    Just hope this helps others looking for answers.

    Dan
     

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